by Ir. H. Rahmat Rukmana $5.00
by Susmayati, B.A., dkk $7.00
by Drs. H.M. Daryanto $7.00
by $12.00
by Dr. Ir. Muhammad Rasyaf, MS $6.00
by Ir. Abbas Siregar Djarijah & Nunung Marlina Djarijah $6.00