Miller, William
Proactive selling : control the process--win the sale
Amacom, 2012
 Buku Teks SO
Miller, William
Proactive selling: control the process, win the sale
American Management Association, 2003
 eBooks
Iland, André
Soft skills : be professionally proactive
Iland Business Pages, 2013
 Buku Teks SO
Davies, liz
Proactive child protection and social work
Learning Matters Ltd., 2008
 Buku Teks
Fahrenheit, Fradhyt
Beauty for sale
FOUmediapublisher, 2006
 Buku Teks SO