by - $12.00
by Drs. H. Kahar Masyhur $12.00
by Prof. Dr. Sondang P. Siagian, M.P.A $9.00
by Dr. Bahder Johan Nasution, S.H., S.M., M.Hum $7.00
by Drs. D. Ketut Sukardi $7.00
by Prof. Dr. Dendasurono P $7.00