Evans, Joel R., author
MacMillan Publishing Company, 1990
Buku Teks
Evans, Joel R., author
Macmillan, 1985
Buku Teks
Terry, George Robert, author
Prentice-Hall, 1957
Buku Teks
Basriana, author
2001
UI - Tesis Membership
Heidingsfield, Myron S., author
Allyn and Bacon, 1968
Buku Teks