Tempest, P.J., author
Pergamon Press, 1981
Buku Teks
Cavendish , 2003
Buku Teks
McLeod, John, author
McGraw-hill Open University press, 2012
Buku Teks
Grellet, Francoise, author
Cambridge University Press, 1981
Buku Teks
Cavendish Publishing Limited, 2002
Buku Teks