Evans, G. Edward, 1937-, author
Neal-Schuman, 2013
Buku Teks
Brown, Adrian, author
Facet Publishing, 2006
Buku Teks
Indiana Purdue University Press, 2014
Buku Teks
Batley, Sue,a uthor
Chandos Publishing, 2007
Buku Teks
Blake, Monica, author
Aslib , 1999
Buku Teks