by Drs. Djohermansyah Djohan $6.00
by Khopkar. S.M $7.00
by $6.00
by Prof. Dr. Ahmad Shalaby $12.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Drs. A. Hasymi Ali, dkk $12.00