Fried, Jason, author
Vermilion, 2010
Buku Teks
Murphy, Martin, author
[American Management Association, ], 2013
eBooks
Hamill, Pete, author
Little, Brown and Company, 2003
Buku Teks
Mangieri, John N., author
John Wiley & Sons, Inc, 2004
Buku Teks
Filkins, Dexter, author
Vintages Books, 2009
Buku Teks