Edwards, David, author
Sage Publication, 2004, 2004
Buku Teks
Manning, George, 1943-, author
McGraw-Hill, 2003
Buku Teks
Rice, David Talbot, author
Thames and Hudson, 1996
Buku Referensi
Dale, Margaret, author
Crest Publishing House, 1999
Buku Referensi
Raheb-Mol, Joanne., author
Oxford University Press, 1998
Buku Referensi