by Kartadjoemena, H.S $7.00
by Ir. Irianto Aritonang, dkk $6.00
by Djojodipuro, Marsudi $6.00
by $18.00
by Drs. Agus M. Hardjana, M.Sc., Ed $6.00
by Prof. Dr. Sondang P. Siagian, M.P.A $9.00