by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by Drs. A. Hasymi Ali $9.00
by Drs. Muchdarsyah Sinungan $11.00
by Prof. Dr. Umar Tirtarahardja dan Drs. La Sula $12.00
by Prof. Drs. H. Lili M. Sadeli, M.Pd & Drs. H. Bedjo Siswanto, M.Si $9.00
by Ir. Moehar Daniel, M.S $7.00