Reference services expertise
edited by Bill Katz
The Haworth Press , 1993
 Buku Teks
Serials and reference services
edited by Robin Kinder; Bill Katz
The Haworth Press, 1990
 Buku Teks
Information brokers and reference services
edited by Robin Kinder; Bill Katz
The Haworth Press, 1988
 Buku Teks
Bopp, Richard E.
Reference and information services : an introduction
Libraries Unlimited, 2001
 Buku Teks
Cassell, Kay Ann
Reference and information services : an introduction
Neal-Schuman, an imprint of the American Library Association, 2013
 Buku Teks