Milan, Deanne K., author
Random House, 1988
Buku Teks
Evans, Desmond W., author
Pitman, 1989
Buku Teks
Ory, John C., author
Sage, 1993
Buku Teks
Spears, Deanne Milan, author
McGraw-Hill, 2000
Buku Teks
Shelton, Patrick J.
London : AN Aspen Publication, 2000,
Buku Teks