edited by George A. Vanasse
Academic Press, 1981
Buku Teks
Owen, George E., author
Harper and Row, 1967
Buku Teks
Craven, Paul R., author
Dickenson Publishing, 1968
Buku Teks
Gopal, Sarvepalli, author
Oxford University Press, 1979
Buku Teks
Dawson, R. MacGregor
Universitas of Toronto Press , 1958
Buku Teks