Reference services in the virtual library Judy E.Myers
 Artikel Jurnal
Liu, Jia, author
The Evaluation of worldwide digital reference services in libraries
Chandos Publishing, 2007
 Buku Teks
Kern, M. Kathleen, author
Virtual reference best practices: tailoring services to your library
[American Management Association, ], 2009
 eBooks
Lankes, R. David, author
Implementing digital reference services : setting standards and making it real
Facet Publishing, 2003
 Buku Teks
Users' hierarchical perspectives on library service quality: a "LibQUAL+" study
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