by Drs. Zifirdaus Adnan & Dra. I. Zifirdaus $9.00
by Ir. Irianto Aritonang, dkk $6.00
by Pandji Anoraga, S.E, M.M $9.00
by Prof. Richard Chauvel $7.00
by - $18.00
by Dr. H. Achmad Ruky $12.00