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, 1991
Buku Teks
Gross, M. Grant
Prentice-Hall, 1995
Buku Teks
Hutabarat, Sahala
UI-Press, 1985
Buku Teks