Scott, W.A.H., author
Erlangga, 1996
Buku Referensi
MeCahill, T.A., author
Erlangga, 1996
Buku Referensi
Kamm, Antony, author
Harper Collins Pub., 1993
Buku Referensi
Collins, Carol
HarperCollins, 1995
Multimedia
edited by Lord Collins of Mapesbury ... [and others]
Sweet & Maxwell , 2006
Buku Teks