Berkowitz, Gerald M., author
Longman, 1994
Buku Teks
edited by Brian Docherty
Macmillan, 1994
Buku Teks
Gray, Richard, 1944-, author
Longman, 1991
Buku Teks
Bonner, Thomas Neville, author
Prentice-Hall, 1963
Buku Teks
Braeman, John
Thomas Y Crowill, 1969
Buku Teks