Hughes, Rebecca
Routledge, 1996
Buku Teks
edited by M.J. Toswell and E.M. Tyler
Routledge, 1996
Buku Referensi
Hughes, Arthur
Cambridge University Press, 1994
Buku Teks
Tarner, Margaret, author
Dian Rakyat, 1991
Buku Teks
Moore, Colette, author
Cambridge University Press , 2011
Buku Teks