Bostwick, Burdette E., author
John Wiley & Sons, 1981
Buku Teks
Beatty, Richard H.
John Wiley & Sons, 1986
Buku Teks
Fry, Ron, author
Career Press, 2002
Buku Teks
Beshara, Tony, 1948- , author
American Management Association, 2008
eBooks
Nierenberg, Alan H., author
American Management Association, 2005
eBooks