by Drs. Sudiyo $7.00
by A. Tresna Sastrawijaya, M.Sc $7.00
by Kamaruddin Ahmad., S.E $7.00
by Soekartawi $5.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $6.00
by Ir. H. Rahmat Rukmana $6.00