Glautier, M.W.E., author
Prentice-Hall, 2001
Buku Teks
Carlson, Arthur E., author
South Western, 1986
Buku Teks
Heintz, James A., author
Thomson/South-Wester, 2005.
Buku Teks
Heintz, James A., author
South-Western Publishing, 1990
Buku Teks
Leonard, William G., author
McGraw-Hill, 1960
Buku Teks