Holden, Greg
Go Google: 20 ways to reach more customers and build revenue with Google business tools
American Management Association, 2008
 eBooks
Arthur, Lisa
Big data marketing: engage your customers more effectively and drive value
Wiley, 2014
 Buku Teks
William, Miller
Knock your socks off prospecting: how to cold call, get qualified leads, and make more money
American Management Association, 2005
 eBooks
Christensen, Mary, 1951-
Be a network marketing superstar: the one book you need to make more money than you ever thought possible
American Management Association, 2007
 eBooks
Futrell, Charles M.
Fundamentals of selling : customers for life
McGraw-Hill/Irwin, 2002
 Buku Teks