Nagel, Stuart S., author
Sage , 1976
Buku Teks
Johnson, Janet Buttolph, 1950-, author
CQ Press, 2012
Buku Teks
Powell, Ronald R., author
Libraries Unlimited, Inc., 2004
Buku Teks
Pickard, Alison Jane, author
Facet Publishing, 2007
Buku Teks
Berg, Bruce L. (Bruce Lawrence), 1954-, author
Pearson, 2004
Buku Teks