edited by John Brady
Cambridge University Press, 1982
Buku Teks
Keeton, William T., author
W.W. Norton, 1967
Buku Teks
Freeman, Scott, author
Prentice-Hall, 2002
Buku Teks
Keeton, William T., author
Penguin Books, 1976
Buku Teks
edited by Irving William Knobloch
Appleton-Century-Crofts, 1967
Buku Teks