Bopp, Richard E., author
Reference and information services : an introduction
Libraries Unlimited, 2001
 Buku Teks
Cassell, Kay Ann, author
Reference and information services : an introduction
Neal-Schuman, an imprint of the American Library Association, 2013
 Buku Teks
Information brokers and reference services
edited by Robin Kinder; Bill Katz
The Haworth Press, 1988
 Buku Teks
Ronan, Jana Smith, author
Chat reference: a guide to live virtual reference services
Libraries Unlimited, 2003
 Buku Teks
Katz, William A., 1924-, author
Introduction to reference work; Volume II: reference services and reference processes
McGraw-Hill, 1987
 Buku Teks
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