Thurman, Harold V.
Charles E. Merrill Publishing Company, 1975
Buku Teks
Anderson, Franz E.
Burgess Publishing, 1979
Buku Teks
Davis, Richard A.
Wm.C. Brown Publishers, 1991
Buku Teks
Gross, M. Grant
Prentice-Hall, 1995
Buku Teks
Hutabarat, Sahala
UI-Press, 1985
Buku Teks