Schwartz, Bernard
Little, Brown & Co., 1988
Buku Teks
Schwartz, Bernard
Little, Brown & Co., 1980
Buku Teks
Culbertson, Jack A.
Prentice-Hall, 1960
Buku Teks
edited by Robert M. Maclean
[Publisher not identified], [Date of publication not identified]
Buku Teks
Wade, H.W.R.
Clarendon Press, 1971
Buku Teks