Kern, M. Kathleen
Virtual reference best practices: tailoring services to your library
[American Management Association, ], 2009
 eBooks
Reinventing reference: how libraries deliver value in the age of Google
edited by Katie Elson Anderson and Vibiana Bowman Cvetkovic
The American Library Association, 2015
 Buku Teks
Kovacs, Diane K.
The virtual reference handbook : interview and information delivery techniques for the chat and e-mail environments / Diane K. Kovacs
Facet Publishing, 2007
 Buku Referensi
Cassel, Kay Ann
Reference and information services in the 21st century : an introduction
Neal-Schuman , 2006
 Buku Teks
Cassell, Kay Ann
Reference and information services in the 21st century : an introduction
Facet Publishing, 2006
 Buku Teks