Miles, James
Science Research Associaties, Inc., 1982
Buku Teks
Trimmer, Joseph F., author
Houghton Mifflin , 1995
Buku Teks
Palmer, Barbara C., author
Allyn and Bacon, 1994
Buku Teks
Beach, David P., author
Prentice-Hall, 1992
Buku Referensi
Hickler, Holly
Allyn and Bacon, Inc., 1980
Buku Teks