by Darmawijaya, St., Pr. $3.00
by Ir. Bambang Cahyono $7.00
by Suharso, A.S.P $6.00
by H. Rahmat Rukmana $6.00
by Drs. Agus M. Hardjana, M.Sc., Ed $6.00
by Ir. Heinz Frick $6.00