Kelly, Gary F.
The Dushkin Publishing Group, 1992
Buku Teks
Kelly, Gary F.
Dushkin Pub, 1992
Buku Referensi
Hogan, Rosemarie Mihelich, author
Appleton-Century Crofts, 1980
Buku Teks
Mahoney, E.R., author
McGraw-Hill, 1983
Buku Teks
New York and London, 1994
Buku Teks