Kovacs, Diane K.
The virtual reference handbook : interview and information delivery techniques for the chat and e-mail environments
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 SO
Evaluation of reference services
edited by Bill Katz and Ruth A. Fraley
Haworth Press, 1984
 Buku Referensi
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 Budaya Universitas Indonesia, 2017
 UI - Skripsi Open