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
Hani Kusumaningsih, author
Evaluasi layanan referensi e-mail Perpustakaan United Nations Information Centre Jakarta = Evaluation of e-mail reference at United Nations Information Centre Library Jakarta
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2016
 UI - Skripsi (Membership)
Kern, M. Kathleen, author
Virtual reference best practices: tailoring services to your library
[American Management Association, ], 2009
 eBooks
Ronan, Jana Smith
Chat reference : a guide to live virtual reference services / Jana Smith Ronan
Libraries Unlimited, 2003
 Buku Referensi
Cassell, Kay Ann, author
Reference and information services : an introduction
Neal-Schuman, an imprint of the American Library Association, 2013
 Buku Teks
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