Morgan, Linda
Beyond smart : Boosting your child's social, emotional, and academic potential
Parent Map, 2010
 Buku Teks SO
Clutterbuck, David, 1947-
The power of empowerment : release the hidden talents of your employees
Crest Publishing House, 1999
 Buku Teks SO
America
New York: W.W.Norton & Company, 1988,
 Buku Referensi
Cho, Hae-il
America
Dong-su-Munhak-sa, 1990
 Buku Teks SO
Mountjoy, Alan B.
Industrialization and under-developed countries
Hutchinson University Library, 1963
 Buku Teks