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
Kern, M. Kathleen
Virtual reference best practices: tailoring services to your library
[American Management Association, ], 2009
 eBooks
Cassell, Kay Ann
Reference and information services : an introduction
Neal-Schuman, an imprint of the American Library Association, 2013
 Buku Teks
Rifni Raihana
Layanan referensi perpustakaan perguruan tinggi: studi kasus di Institut Pertanian Bogor = Reference services in academic Library: case study at Bogor Agricultural University
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2017
 UI - Skripsi Open
Liu, Jia
The Evaluation of worldwide digital reference services in libraries
Chandos Publishing, 2007
 Buku Teks