by Y. T. Prasetiyo $5.00
by Ir. H. Rahmat Rukmana, MBA., MSc. $5.00
by Sardi, L.A., SJ. $7.00
by Ir. St. Eka Adiwibawa $9.00
by H. Rahmat Rukmana $6.00
by Ir. Sukim Prayitno $5.00