Redstone, Louis G.
New York: McGraw-Hill, 1976
Buku Teks
Marsh, S. B.
McGraw-Hill, 1992
Buku Teks
Nee, Paul A.
John Wiley & Sons, 1996
Buku Teks
Dunung, Sanjyot P., author
Lexington Books, 1995
Buku Referensi
Curtis, Dan B., author
Remaja Rosdakarya, 1992
Buku Teks