by Ir. H. Rahmat Rukmana, MBA., MSc. $5.00
by S. Soegijanto $11.00
by Ir. Susy Fatena Roestiyanti, M.Sc $7.00
by Aziz Alimul $11.00
by Syaifuddin $12.00
by Ir. M. Lies Suprapti $7.00