Wright, M.G.
Tata McGraw-Hill, 1981
Buku Teks
Gup, Benton E.
John Wiley & Sons, 1987
Buku Teks
Bradley, Joseph F.
Dryden Press, 1974
Buku Teks
Van Horne, James Carter, 1935-
Prentice Hall International, 1998
Buku Teks
Lasher, William R.
Western College Publishing , 2000
Buku Teks