Anderson, Ronald A., author
South-Western Publishing Company, 1967
Buku Teks
Beatty, Jeffrey F.
Thomson, South-Western, 2003
Buku Teks
Anderson, Ronald A., author
South-Western Publishing Co., 1987
Buku Teks
Cheeseman, Henry R., author
Prentice-Hall, 1998
Buku Teks
Brown, Gordon W.
McGraw-Hill , 1984
Buku Teks