Rickertsen, Rick, author
American Management Association, 2006
eBooks
Campbell, Anthony, author
Sheldon, 1992
Buku Teks
Remley, Jim, author
American Management Association;, 2008
eBooks
Tracy, Brian, author
Elex Media Komputindo, 2006
Buku Teks
Axelrod, Wendy, author
Berrett Koehler, 2011
Buku Teks