Crawford, John, author
Aslib, 2000
Buku Teks
Chapman, Liz, author
Facet Publishing, 2004
Buku Teks
Reynolds, Amanda, author
Open universtity press , 2000
Buku Teks
edited by Gary E. Day and Sandra G. Leggat
Cambridge University Press, 2015
Buku Teks
Bopp, Richard E., author
Libraries Unlimited, 2001
Buku Teks