Ronan, Jana Smith
Chat reference : a guide to live virtual reference services
Libraries Unlimited, 2003
 Buku Referensi
Kern, M. Kathleen
Virtual reference best practices: tailoring services to your library
American Management Association, 2009
 eBooks
Kovacs, Diane K.
The virtual reference handbook : interview and information delivery techniques for the chat and e-mail environments
Facet Publishing, 2007
 Buku Referensi
Cassell, Kay Ann
Reference and information services in the 21st century : an introduction
Facet Publishing, 2006
 Buku Teks
Cassel, Kay Ann
Reference and information services in the 21st century : an introduction
Neal-Schuman , 2006
 Buku Teks SO