Parmley, Robert O., author
McGraw-Hill, 1981
Buku Referensi
Brewer, Richard, author
Saunders College Publishing, 1982
Buku Referensi
Ranz, John H.
W.H. Anderson Co., 1966
Buku Teks
Swerdlik, Mark E.
Mayfield Publishing Company, 1999
Buku Teks
Gyeszly, Suzanne D., author
The Borgo Press, 1994
Buku Referensi