Pedley, Paul, author
Facet, 2006
Buku Teks
Brown, Micah, author
Prentice-Hall, 1999
Buku Referensi
Batley, Sue,a uthor
Chandos Publishing, 2007
Buku Teks
Blake, Monica, author
Aslib , 1999
Buku Teks
Evans, G. Edward, 1937-, author
Neal-Schuman, 2013
Buku Teks