Walkup, Renee P.
Selling to anyone over the phone
American Management Association, 2006
 eBooks
Tracy, Brian
The power of charm: how to win anyone over in any situation
American Management Association, 2006
 eBooks
Taylor, Jim
Selling to the new elite: discover the secret to winning over your wealthiest prospects
American Management Association;, 2011
 eBooks
Taylor, Jim
Selling to the new elite : discover the secret to winning over your wealthist prospects
Amacom, 2011
 Buku Teks SO
Allen, Peter
Selling
Pitman, 1998
 Buku Teks SO