Camp, Sue C., author
McGraw-Hill, 2001
Multimedia
Grellet, Francoise, author
Cambridge University Press, 1994
Buku Referensi
Whetten, David A., author
Prentice-Hall, 2007
Buku Teks
Boyd, Andrew
Frederick A Praeger , 1962
Buku Teks
Goad, Philip
The Watermark Press, 1998
Buku Teks