Clyde, Paul H. (Paul Hibbert), author
Prentice-Hall, 1948
Buku Teks
Hudson, G. F., author
Clarendon Press , 1937
Buku Teks
Clyde, Paul H. (Paul Hibbert), author
Prentice-Hall, [date of publication not identified]
Buku Teks
Stephan, John J.
Stanford University Press, 1994
Buku Teks
Clyde, Paul Hibbert, author
Prentice-Hall, 1960
Buku Teks