Bottherill, George
The philosophy of psychology
Cambridge University Press, 1999
 Buku Teks SO
Handbook of juvenile forensic psychology and psychiatry
edited by Elena L. Grigorenko
Springer, 2012
 eBooks
International encyclopedia of psychiatry, psychology, psychoanalysis, and neurology
editor by Benjamin B. Wolman
New York : Van Nostrand Reinhold Company, 1977,
 Buku Referensi
Santrock, John W.
Education psychology
McGraw-Hill, 2008
 Buku Teks
Khan, Hazrat Inayat
Philosophy, Psychology, Mysticism
The Sufi International Headquarter's, 1956
 Buku Teks SO