Miller, Roger LeRoy
Thomson West, 2007
Buku Teks
Beatty, Jeffrey F.
South Western Cengage Learning, 2011
Buku Teks
Bobbs-Merril, 1956
Buku Teks
Eisenberg, Melvin A.
Little, Brown, 1976
Buku Teks
edited by Monrad G. Paulsen
Columbia University Press, 1959
Buku Teks