Barry, Pete S., author
Thames and Hudson, 2014
Buku Teks
Weller, Bart, author
Springer, 2012
eBooks
Griffin, W. Glenn
HOW Books, 2010
Buku Teks
Segal, Lloyd M., 1948- , author
American Management Association, 2007
eBooks
Bob Gordon, consultant editor; Maggie Gordon, consultant editor
Watson-Guptill Publications, 2002
Buku Teks