Agnew, Palmer W., author
Allyn and Bacon, 1996
Buku Teks
Wiatrowski, Claude A., author
McGraw-Hill, 1980
Buku Teks
Leventhal, Lance A
Prentice-Hall, 1987
Buku Teks
Artwick, Bruce A.
Prentice-Hall, 1980
Buku Teks
Hanley, T., author
DP Publications, 1993
Buku Teks