Merritt, Davis, author
[American Management Association;, ], 2005
eBooks
Herman, Susan N., author
Oxford Univesity Press, 2011
Buku Teks
Jones, Marjorie, author
Barry Rose Publishers, 1974
Buku Teks
Briggs, Mark, author
Sage, 2012
Buku Teks
London : Collier-Macmillan, 1967,
Buku Teks