by Abdoelmanap, Soerowo & T.H. Manurung $6.00
by Ir. H. Rahmat Rukmana, MBA $5.00
by Ir. Hatta Sunanta, B.Sc., MS $6.00
by Djamin, Zulkarnain $6.00
by Ir. Bambang Cahyono $7.00
by Ir. R. Bambang Soelarso $6.00