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
Kern, M. Kathleen, author
Virtual reference best practices: tailoring services to your library
[American Management Association, ], 2009
 eBooks
McMenemy, David, author
Delivering digital services : a handbook for public libraries and learning centres
Facet, 2006
 Buku Referensi
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