Fedrizzi, Mariann, author
South Western Cengage Learning, 2011
Buku Teks
Fryar, Maridell
National Textbook Co., 1979
Buku Teks
Jacobson, Michael D., author
Routledge, 1987
Buku Teks
Ulanoff, Stanley M.
Hastings House, 1977.
Buku Teks
Ulanoff, Stanley M.
Hastings House , 1977
Buku Teks