Ennico, Cliff, author
American Management Association, 2008
eBooks
Kettell, Brian, author
John Wiley & Sons, 2010
Buku Teks
Kettell, Brian, author
Wiley, 2010
Buku Teks
Holden, Greg, author
American Management Association, 2006
eBooks
Japan Information Center consulat General of Japan at New York, 1988
Buku Teks