Fraser, George Sutherland, 1915-
Published for the British Council and the National Book League by Longmans, 1965
Buku Teks SO
Marjorie Howes, John Kelly, editor
Cambridge University Press, 2008
Buku Teks SO
Jeffares, A. Norman
Stanford University Press, 1968
Buku Teks SO
Chicago : The Modern Poetry Association
Majalah, Jurnal, Buletin
Shannon, George W. B.
Harper & Row , 1989
Buku Teks SO