Greenwood Press, 2002
Buku Referensi
Fothergill, Richard, author
Clive Bingley , 1984
Buku Teks
Deanna B. Marcum, editor
Greenwood Press, 2001
Buku Teks
Brown, Adrian, author
Facet Publishing, 2006
Buku Teks
Editor by Wei Wei; Sue O'Neill Johnson; Sylvia E.A. Piggott
The Haworth Information Press, 2002
Buku Teks