by Prof. dr. Arjatmo tj., dr. boenyamin S $5.00
by Ketut Rindjin $7.00
by Prof. DR. Taliziduhu Ndraha $11.00
by Darmawijaya, St., Pr. $3.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $6.00
by $5.00