Kruger, Arthur N.
The Scarecrow Press, Inc., 1968
Buku Teks
Fowler, Robert Booth, author
University Press of Kansas, 1991
Buku Teks
edited by Michael Kelly
MIT Press, 1994
Buku Teks
Cassell Australia, 1978
Buku Teks
David Held, Anthony McGrew, editor
Polity Press, 2000
Buku Teks