Atkin, Douglas, author
Portfolio, 2004
Buku Teks
Mark, Margaret, author
McGraw-Hill , 2001
Buku Teks
Ford, J. Kevin, author
John Wiley & Sons, 2005
Buku Teks
Post, Karen, author
[American Management Association, ], 2004
eBooks
edited by Debbie Millman
Rockport Publishers, 2012
Buku Referensi