Coffman, Steve, author
Going live: starting and running a virtual reference service
[American Library association, American Library association], 2003
 eBooks
Kern, M. Kathleen, author
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 / 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
Personnel issues in reference services / edited by Bill Katz and Ruth A. Fraley
Haworth Press, 1986
 Buku Referensi
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