Tingley, Judith C., author
American Management Association;;, 1996
eBooks
Mortensen, Kurt W., author
American Management Association, 2008
eBooks
Burrows, Terry, author
Carlton, 2011
Buku Teks
McKnight-Trontz, Jennifer, author
Torrent Books, 2004
Buku Teks
Arden, Paul, author
Phaidon, 2003
Buku Teks