Liu, Jia, author
The Evaluation of worldwide digital reference services in libraries
Chandos Publishing, 2007
 Buku Teks
Evaluation of reference services / edited by Bill Katz and Ruth A. Fraley
Haworth Press, 1984
 Buku Referensi
Lankes, R. David, author
Implementing digital reference services : setting standards and making it real
Facet Publishing, 2003
 Buku Teks
Ronan, Jana Smith, author
Chat reference: a guide to live virtual reference services
Libraries Unlimited, 2003
 Buku Teks
Cassell, Kay Ann, author
Reference and information services in the 21st century : an introduction
Facet Publishing, 2006
 Buku Teks
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