Brooks/Cole, 1999
Buku Teks
Christian, Gary D., author
John Wiley and Sons, 1977
Buku Teks
Christian, Gary D., author
John Wiley and Sons, 1986
Buku Teks
Skoog, Douglas A., author
Saunders College Publishing, 1996
Buku Teks
Kennedy, John H., author
Saunders College, 1990
Buku Teks