Information brokers and reference services
edited by Robin Kinder; Bill Katz
The Haworth Press, 1988
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Bopp, Richard E.
Reference and information services : an introduction
Libraries Unlimited, 2001
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Cassell, Kay Ann
Reference and information services : an introduction
Neal-Schuman, an imprint of the American Library Association, 2013
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Cassell, Kay Ann
Reference and information services in the 21st century : an introduction
Facet Publishing, 2006
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Cassel, Kay Ann
Reference and information services in the 21st century : an introduction
Neal-Schuman , 2006
 Buku Teks SO