edited by Olaf F. Larson, Edward O. Moe, and Julie N. Zimmerman
Westview Press, 1992
Buku Teks
Carlson, John E.
McGraw-Hill, 1981
Buku Teks
Brunner, Edmund de S.
McGraw-Hill, 1933
Buku Teks
edited by Barbara Ching and Gerald W. Creed
Routledge , 1997
Buku Teks
edited by Richard A. Crosby, Monica L. Wendel, Robin C. Vanderpool, Baretta R. Casey
Jossey-Bass, 2012
Buku Teks