by A. Widyamartaya, B.A $3.00
by Ir. H. Rahmat Rukmana, MBA., MSc. $6.00
by H. Rahmat Rukmana $6.00
by Gutomo Priyatmono $12.00
by Fritz Wilkening $12.00
by Ir. Rindit Pembayun, M.P. $6.00