Smith, Carry D.
Boston Houghton Mifflin Co 1985,
Buku Teks
Glahe, Fred R.
San Diego Harcourt Brace Jovanovich, Inc.,
Buku Teks
Glueck, William F., author
McGraw-Hill, 1984
Buku Teks
by Joseph C. Latona ... [and others]
South-Western Publishing, 1984
Buku Teks
Glueck, William F., author
McGraw-Hill, 1980
Buku Teks