Kern, M. Kathleen
Virtual reference best practices: tailoring services to your library
American Management Association, 2009
 eBooks
Donzel, E. Van
Islamic desk reference
E.J. Brill, 1994
 Buku Referensi
Heisler, Sanford I
The Wiley engineer's desk reference
John Wiley & Sons, 1984
 Buku Referensi
World desk reference
edited by Andrew Heritage
Dorling Kindersley, 2000
 Buku Referensi
Lewis, Richard J.
Hazardous chemicals desk reference
Wiley-Interscience, 2002
 Buku Referensi