Brownell, Baker
Harper & Brothers Publishers , 1950
Buku Teks
Etzioni, Amitai, author
A Touchestone Book, 1994
Buku Teks
John E. Tropman, John L. Erlich, Jack Rothman
F.E.Peacock, 2001
Buku Teks
Matthews, Mark Stanley.
Harper , 1954
Buku Teks
edited by John E. Tropman, John L. Erlich, Jack Rothman
F.E.Peacock, 1995
Buku Teks