Walthall, Wylie A., author
Harper and Row, 1987
Buku Teks
Wright, M. G., author
McGraw-Hill , 1970
Buku Teks
Cunningham, William H., author
South-Western, 1984
Buku Teks
Madura, Jeff, author
South-Western College, 2001
Buku Teks
Straub, Joseph T., author
Kent, 1985
Buku Teks