State University of New York Press, 2001
Buku Teks
Emerson, Rupert, author
Cambridge: Harvard University Press, 1960
Buku Teks
New Jersey Prentice-Hall 1965
Buku Teks
Bock, Edwin A.
London Prentice-Hall 1962
Buku Teks
Daly, Frederick Michael
Melbourne Sun Books 1978
Buku Teks