Moody, Paul E.
Decision making proven methods for better decisions / Paul E. Moody
McGraw-Hill, 1983
 Buku Teks SO
Baskinger, Mark
Drawing ideas : a hand-drawn approach for better design
Watson-Guptill Publications, 2013
 Buku Referensi
Gonzalez, Ruben
Becoming Unstoppable : menang dalam olimpiade kehidupan anda! = Becoming unstoppable / Ruben Gonzalez ; penerjemah, Irine Yovita
Gramedia Pustaka Utama, 2008
 Buku Teks SO
Johnson, Julian
The Path of the masters
Radha Soami Beas, 1985
 Buku Teks SO
Mather, Peter
A change for the better
South Australia, 1984
 Buku Teks SO