Breithaupt, Tim
10 steps to sales success: the proven system that can shorten the selling cycle, double your close ratio, and significantly increase your income
American Management Association, 2003
 eBooks
Wilson, Susan B.
Goal setting: how to create an action plan and achieve your goals
American Management Association, 2008
 eBooks
James, Elaine S.T.
Simplify your work life: menyiasati cara Kerja demi lebih menikmati hidup / Elaine ST. James;
Gramedia, 2004
 Buku Teks SO
Webster, Richard
Creative visualization for beginners : achieve your goals & make yur dreams come true
Llewellyn Publication, 2009
 Buku Teks SO
Smith, Harriet Fullen
Your life as a citizen
Ginn and Company, 1961
 Buku Teks