Mills, Paul, author
Routledge, 2006
Koleksi Publik
Dawson, Paul, author
Routledge, 2005
Buku Teks
Skaife, Linda
National Textbook Company, 1994
Buku Teks
Cambridge University Press, 2004
Buku Teks
Hewings, Martin, author
Cambridge University Press , 2004
Buku Teks