Weingarten, Henry
McGraw-Hill , 1996
Buku Teks
Weiss, Steve Mark, author
American Management Association, 2008
eBooks
Beck, Roger, author
Blackwell Publishing, 2007
Buku Teks
Foreman, Patricia L.
Good Earth Publications , 1992
Buku Teks
Ho, Peng Yoke, author
RoutledgeCurzon, 2003
Buku Teks