Kramish, Arnold, author
Harper & Row, 1963
Buku Teks
McCormick, James M., author
Thomson, 2005
Buku Teks
Herrick, Christopher, author
Longman, 2003
Buku Teks
Rourke, Francis E., author
John Hopkins University Press, 1972
Buku Teks
edited by Stephen Clarkson
The Canadian, 1968
Buku Teks