by Yuswar Zainul Basri & Mulyadi S $9.00
by Drs. Sidarta Gautama $7.00
by Abbas Salim $9.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by Drs. G. Kartasapoetra $7.00
by Drs. Save M. Dagun $7.00