Danbury : Lexicon Publications, Inc., 2004,
Buku Referensi
Crawley, Angela, author
Oxford University Press, 1994
Buku Referensi
Burke, Claire
New York Routledge, 1999
Buku Teks
Rozakis, Laurie
ARCO, 1990
Buku Teks
Bradford, Barbara
Cambridge University Press, 1988
Buku Teks