Nagel, Stuart S., author
Sage , 1976
Buku Teks
Mellon, Constance A., author
Greenwood Press, 1990
Buku Teks
Wildemuth, Barbara M., author
Libraries Unlimited, 2009
Buku Teks
edited by, Wayne B. Jonas, Cindy C. Crawford
Churchill Livingstone, 2003
Buku Teks
New York Houghton Mifflin c 1968
Buku Teks