Beard, Charles A., author
Prentice-Hall, 1962
Buku Teks
Grey, David L., author
North Western University Press, 1968
Buku Teks
Devol, Kenneth S., author
Hastings house Publisher, 1971
Buku Teks
Tresolini, Rocco J., author
J.B. Lippincott, 1963
Buku Teks
Schwartz, Bernard, author
The Ronald Press, 1957
Buku Teks