When you walk into a library with a question, you usually expect to leave with a book, an article, or a database printout. But some questions cannot be answered by documents alone. A doctoral student trying to understand an unpublished surgical technique, a startup founder needing the latest on a patent filing, or a journalist verifying a technical claim often needs to talk to a living person who knows the answer. This is where the human dimension of referral service becomes central. A referral service does not always hand over a document; it connects the user to the right person or institution. Among all the resources a referral service can point to, people, the experts and professionals who carry knowledge in their heads, are often the most valuable.
Table of Contents
- Who are these key people?
- Information professionals at the centre
- Subject experts and practitioners
- How experts help when documents fall short
- Tacit knowledge that books rarely capture
- Currency and the cutting edge
- Interpretation, verification, and unpublished detail
- Finding the right expert
- Biographical reference sources
- Professional directories and institutional networks
- Building and maintaining an expert resource file
Who are these key people?
In library and information science, individuals who hold specialised knowledge are treated as a distinct category of information source, often called human sources. These are people sought out for first-hand knowledge, insights, and interpretations that are simply not available in written or digital form. A referral service maintains awareness of who these people are so that users can be guided to them when a query exceeds what the collection can satisfy.
Information professionals at the centre
The first group is the librarians and information professionals who run the referral process itself. Reference service has long been defined as personal assistance provided to people seeking information, usually delivered by professionals trained in the field. A skilled reference librarian acts as a navigator. They may not be a subject expert in genetics or aeronautics, but they are experts at one crucial task: recognising when a question is beyond the library’s scope and knowing exactly which person or agency can take it forward. The role of the reference librarian as a mediator between the user and information is the backbone of any referral system.
Subject experts and practitioners
The second and larger group is made up of the specialists themselves. These fall into a few practical types:
Researchers and academics such as professors, scientists, and scholars who work at the frontier of their disciplines. They often know about findings months or years before those findings appear in published journals.
Practitioners with applied knowledge like doctors, engineers, lawyers, and architects. Their value lies in knowing how theory works in real conditions, including the exceptions and shortcuts that textbooks rarely record.
Technicians and skilled operators who understand how specific equipment, software, or processes behave on the ground. A laboratory technician may be the only person who knows why a particular instrument gives inconsistent readings, knowledge that exists nowhere in print.
Together, these people form a pool of expertise that no single library collection can ever fully replicate. A referral service treats them as a genuine resource, comparable in importance to its books and databases.
How experts help when documents fall short
Documents are excellent at storing settled, verified knowledge. But there are several situations where even a well-stocked library cannot help, and a person can.
Tacit knowledge that books rarely capture
A large part of professional expertise is tacit knowledge, the kind that is difficult to write down. A surgeon’s judgement about when not to operate, an engineer’s instinct for which design will fail under stress, or a craftsman’s feel for a material are all forms of knowledge built through years of practice. When a user needs this kind of guidance, a referral to the practitioner is far more useful than any handbook. The library recognises the limit of its documents and bridges the gap by pointing to a person.
Currency and the cutting edge
Published information always lags behind reality. A research paper can take a year or more to move from experiment to print. For someone working on a fast-moving topic, the most current information lives in the minds of active researchers, not on the shelf. A referral service that maintains contacts with subject specialists, or with research institutions, can connect a user to this living, up-to-date knowledge. For instance, a student researching advanced biology might be directed to a centre like the Indian Institute of Science, where active researchers and specialised facilities can address questions that local collections cannot.
Interpretation, verification, and unpublished detail
Some information is too sensitive, too specialised, or too new to be widely published. Experts can interpret conflicting evidence, confirm whether a claim is sound, and point users toward unpublished reports or ongoing projects. In many cases, a single conversation with the right professional saves a user weeks of searching through documents that would never have given a complete answer. This is the core promise of referral service: it extends the library’s reach far beyond its physical and digital holdings.
Finding the right expert
Knowing that experts are valuable is one thing. Locating the correct expert, with verified credentials and current contact details, is the real skill. This is where the library’s specialised reference tools come into play.
Biographical reference sources
Biographical sources are publications that list details about people, including their qualifications, positions, achievements, and fields of work. They are the starting point for identifying who is an authority on a given subject. The standard biographical reference tools include works such as Who’s Who and Dictionary of National Biography titles.
A few categories are worth knowing:
Who’s Who publications provide concise biographies of living people of eminence. India Who’s Who, for example, has long carried thousands of short biographies of prominent Indians across politics, civil service, education, science, and the arts, with entries arranged by profession. Marquis Who’s Who in the World performs a similar function at the global level.
Biographical dictionaries collect entries on many individuals, often within a single field such as science, literature, or music. They help a librarian confirm a person’s area of expertise before making a referral.
Subject-specific and obituary indexes help trace less famous specialists. Major research libraries describe how to locate collective biographies through catalogues and union catalogues like WorldCat when a specialist is too recent or too niche to appear in standard directories.
Large national libraries also maintain extensive biographical databases covering living and deceased people from many countries and professions, which a referral service can search to confirm an expert’s standing and contributions.
Professional directories and institutional networks
While biographical sources tell you about a person, directories tell you how to reach them and which organisation they belong to. Directories list institutions, associations, and individuals along with their roles and contact details. The main types include:
Professional directories published by associations of doctors, engineers, lawyers, and other professionals, listing members and their specialisations. The membership rolls of bodies such as medical councils or engineering institutions are practical tools for locating qualified practitioners.
Trade and business directories that cover companies and industrial organisations, useful when a query requires commercial or technical expertise.
Government and institutional directories that identify officials, departments, and research bodies. When a user needs authoritative national data, a referral might point them to a government agency such as the Ministry of Statistics and Programme Implementation, which holds official statistical information that no general library would attempt to duplicate.
Referral services also rely on networks of institutions to extend their reach. India has built a strong fabric of documentation and information centres, and a glance at the list of libraries and information centres in India shows specialised bodies for science, medicine, and social sciences. A librarian who knows this landscape can route a query to the institution best placed to supply both documents and human expertise.
Building and maintaining an expert resource file
An effective referral service does not locate experts from scratch every time. Instead, it builds and maintains its own resource file or database of contacts. This file records the names, affiliations, areas of expertise, and contact details of specialists, institutions, and agencies relevant to its users. It is compiled using biographical sources and directories, then kept current as people change roles and as new specialists emerge.
Maintaining such a file involves real responsibility. The library must verify credentials so that users are not misdirected to unqualified individuals. It must respect the privacy of the experts and obtain their willingness to be contacted. And it must update entries regularly, because outdated contact information defeats the entire purpose. When done well, this quiet background work turns a library into a reliable hub that links people who have questions with people who have answers.
What do you think? If the most current and practical knowledge in a field lives in people’s minds rather than in documents, how should libraries balance their investment between building collections and building networks of experts? And in an age of online professional platforms, what unique value does a librarian-curated referral to a verified expert still offer that a quick internet search cannot?
References
- https://www.encyclopedia.com/media/encyclopedias-almanacs-transcripts-and-maps/reference-services-and-information-access
- https://iisc.ac.in/
- https://egyankosh.ac.in/bitstream/123456789/33148/1/Unit-11.pdf
- https://guides.library.harvard.edu/biography/dictionaries
- https://guides.loc.gov/c.php?g=1428775&p=10607105
- https://www.mospi.gov.in/
- https://en.wikipedia.org/wiki/Libraries_and_Information_Centres_in_India

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