by Dr. Ronald Hutapea, SKM, Ph.D $9.00
by Halimuddin, S.H $7.00
by Dr. Hamzah B. Uno, M.Pd $9.00
by Bachrawi Sanusi $7.00
by Syam Hardy $7.00
by Prof. DR. Koentjaraningrat $9.00
by $4.00