by Drs. Abdulsyani $9.00
by RH. Wiwoho $7.00
by Johny S.L Chiu, dkk $11.00
by Drs. G. Kartasapoetra, dkk $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Freddy Rangkuti $9.00
by Budi Rachmat $11.00
by $7.00
by James Luhulima $9.00
by $6.00
by Dr. Joan Freeman $9.00
by Ir. M. Lies Suprapti $6.00