Andrews, Richard, author
Open University Press, 1991
Buku Teks
Chicago : The Modern Poetry Association
Majalah, Jurnal, Buletin
Midgley, Mary, author
Routledge, 2006
Buku Teks
O`Dowd, Bernard, author
Angust & Robertson, 1963
Buku Teks
Kennedy, X. J., author
Pearson Longman , 2005
Buku Teks