Fodor, John T.
The Williams & Willkins, 1995
Buku Teks
Bryant, John
Cornel Univ. Press, 1969
Buku Teks
Russell, Robert D.
National Education Association, 1975
Buku Teks
Greene, Walter H., author
Waveland Press, 1984
Buku Teks
edited by Betty P. Mathews
Third Party Publishing, 1982
Buku Teks