Donnelly, Daniel, author
Page One Publishing, 2011
Buku Referensi
Donnelly, Daniel
Rockport Publishers, 2011
Multimedia
Hewes ,Rachel, author
Rockport Publishers, 2010
Buku Referensi
Dabner, David, author
Page One, 2006
Buku Teks
Heskett, John
Oxford University Press, 2002
Buku Teks