by Prof. Dr. S. Nasution, M.A. $6.00
by Pranita Dewi $6.00
by Prof. Drs. S. Pamudji, M.P.A $11.00
by Dr. Zakiah Daradjat, dkk $11.00
by Aan Rohanah, S.Pd $6.00
by Aziz Alimul $11.00