Stone, Bob
Successful telemarketing : opportunities and techniques for increasing sales and profits/ Bob Stone and John Wyman
Prentice-Hall, 1986
 Buku Teks
Carson, Gerald
Old country store/Gerald Carson
University Press , 1954
 Buku Teks
Wayland, Robert E
Customer connections: new strategies for growth/Robert E.Wayland & Paul M. Cole
Harvard Business School Press, 1997
 Buku Teks
Christensen, Mary, 1951- , author
Be a recruiting superstar: the fast track to network marketing millions
American Management Association, 2008
 eBooks
Leboff, Grant, author
Digital selling : how to use social media and the web to generate leads and sell more
Kogan Page, 2016
 Buku Teks
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