Weisman, Herman M.
Charles E. Merrill Publishing Company, 1980
Buku Teks
Haramundanis, Katherine
Digital Press, 1992
Buku Teks
Gould, Jay R., author
VGM Career Horizons, 1994
Buku Teks
Lindsay, David, author
Longman, 1995
Buku Teks
Alley, Michael
Springer-Verlag, 1996
Buku Teks