Reference services in the virtual library Judy E.Myers
 Artikel Jurnal
Cassell, Kay Ann, author
Reference and information services in the 21st century : an introduction
Facet Publishing, 2006
 Buku Teks
Liu, Jia, author
The Evaluation of worldwide digital reference services in libraries
Chandos Publishing, 2007
 Buku Teks
Reference services today : from interview to burnout
edited by Bill Katz; Ruth A. Fraley
Haworth Press, 1987
 Buku Teks
Cassel, Kay Ann, author
Reference and information services in the 21st century : an introduction
Faced Publishing, 2009
 Buku Teks
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