Koprowska, Juliet, author
Learning Matters, 2007
Buku Teks
McIntosh, Perry, author
[American Management Association;, ], 2008
eBooks
MTP Press , 1983
Buku Teks
Berscheid, Ellen, author
Prentice-Hall, 2005
Buku Teks
Knapp, Mark L., author
Allyn and Bacon, 1996
Buku Teks