Johns, Edward B.
McGraw-Hill, 1966
Buku Teks
Dignan, Mark B., author
Lea & Febiger, 1981
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