by Ir. Heinz Frick & Pujo L. Setiawan $7.00
by Ir. Arifin Arief, M. P $5.00
by $4.00
by Sutarni M. Soerjowinoto $6.00
by Heru Susanto $6.00
by Drs. Al. Soenarto S.W., dkk $4.00
by Ir. Ibnu Dwi Buwono, M.Si $7.00