Boyer, Ernest L.
Harper & Row, Publishers, 1983
Buku Teks
Anderson, Vernon E.
The Ronald Press, 1962
Buku Teks
Day, Barbara
Maxwell Macmillan, 1994
Buku Teks
Robertson, Cathie, 1946-, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Ramo, Simon
Hill and Wang, 1988
Buku Teks