Fordham, Jefferson B.
University of Pennsylvania Press, 1959
Buku Teks
Saywell, John J.
University of Toronto Press , 1957
Buku Teks
Adrian, Charles R., author
McGraw-Hill , 1978
Buku Teks
Plutto Press, 1989
Buku Teks
Burns, James McGregor, author
Prentice-Hall, 1972
Buku Teks