Nickels, William G.
Marketing communications and promotion
Grid, INC , 1976
 Buku Teks
Yarker, K.A.
International marketing / K.A. Yarker
Business Books c, 1976
 Buku Teks
Stone, Bob
Successful telemarketing : opportunities and techniques for increasing sales and profits/ Bob Stone and John Wyman
Prentice-Hall, 1986
 Buku Teks
Wayland, Robert E
Customer connections: new strategies for growth/Robert E.Wayland & Paul M. Cole
Harvard Business School Press, 1997
 Buku Teks
Kotler, Philip
Marketing moves : a new approach to profits, growth, and renewal
Harvard Business School Press, 2002
 Buku Teks