Andrews, Wayne
Macmillan, 1978
Buku Teks
Klein, Philip
Jossey-Bass, 1968
Buku Teks
Jansson, Bruce S., author
Thompson, 2005
Buku Teks
Boyd, Maurice
Allyn and Bacon, Inc., 1969
Buku Teks
by Thomas L. Hartshorne ... [and others]
Longman, 2003
Buku Teks