Katz, Wiliiam A.
Introduction to reference work : volume II, reference services and reference processes / William A. Katz
McGraw-Hill, 1992
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Palmer, Roger C.
Online reference and information retrieval / Roger C. Palmer
Libraries Unlimited, 1987
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Expert systems in reference services / Christine Roysdon, Howard D. White, editors
Haworth Press, 1989
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Katz, William A., 1924-
Introduction to reference work
McGraw-Hill, 2002
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Bopp, Richard E.
Reference and information services : an introduction
Libraries Unlimited, 2001
 Buku Teks SO