Maddi, Salvatore R., author
[American Management Association, ], 2005
eBooks
Maddi, Salvatore R., author
AMACOM, 2005
Buku Teks
Johnson, Falk S., author
Houghton Mifflin, 1965
Buku Teks
Gawain, Shakti, author
Whatever Publisher, 2002
Buku Teks
Levine, Stuart R., author
Simon and Schuster, 1993
Buku Teks