Itule, Bruce D., author
McGraw-Hill, 1994
Buku Teks
Dick, Jill, author
A and C Black, 1994
Buku Teks
Yates, Edward D., author
Contemporary Publishing Company, 1981
Buku Teks
Berner, R. Thomas, author
Allyn and Bacon, 1992
Buku Teks
edited by Jean M. Fredette
Writer`s Digest Books, 1988
Buku Teks