by Al. Wahjasudibja, Pr. $12.00
by Peursen, CA van, Prof. Dr $7.00
by Ir. Bambang Cahyono $6.00
by Haryoto $5.00
by Jonni M.S, M.Sitorus, Nelly K $7.00
by Drs. G. Kartasapoetra $7.00