Lincoln, W. Bruce
Chandler Publishing Company, 1968
Buku Teks
[compiled by] Paul F. Boller, Jr. and Ronald Story
Houghton Mifflin , 1988
Buku Teks
Kennedy, Richard
Macmillan Publishing Co. Inc, 1982
Buku Teks
editor, Cameron Hazlehurst
Australian National University Press, 1979
Buku Teks
Buckley, K., author
Burns Philip , 1981
Buku Teks