Levinson, Nan, author
[American Management Association;, ], 2000
eBooks
McLean, Gary N., author
Paradigm Publishing, 1991
Buku Teks
Yuen, Francis K.O., author
Thompson, 2003
Buku Teks
Joyce, Helen de Silva, author
Phoenix Education, 2000
Buku Teks
Blake, Gary
McGraw-Hill, 1995
Buku Teks