Block, Mervin, author
CQ Press, 2011
Buku Teks
Block, Mervin, author
Sage, 2012
Buku Teks
Berner, R. Thomas, author
Allyn and Bacon, 1992
Buku Teks
Rich, Carole, author
Wadsworth and Cengage Learning, 2010
Buku Teks
edited by Jean M. Fredette
Writer`s Digest Books, 1988
Buku Teks