McGraw-Hill, 1994
Buku Referensi
Cawkell, Tony, author
Routledge, 1996
Buku Referensi
edited by Henk M. Blanken ... [and others]
Springer, 2007
Buku Teks
Dowling, Jennifer Coleman, author
McGraw-Hill, 2012
Buku Teks
Jeffcoate, Judith, author
Prentice Hall, 1995, 1995
Buku Teks