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
Cassell, Kay Ann, author
Reference and information services in the 21st century : an introduction
Facet Publishing, 2006
 Buku Teks
Cassel, Kay Ann, author
Reference and information services in the 21st century : an introduction
Faced Publishing, 2009
 Buku Teks
Cassel, Kay Ann, author
Reference and information services in the 21st century : an introduction
Neal-Schuman , 2006
 Buku Teks
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