by Ir. Lisdiana Fachruddin
$5.00

by Ir. M. Lies Suprapti
$7.00

by Markus Zahnd
$7.00

by Ir. H. Rahmat Rukmana, MBA., M.Sc. & Uu Sugandi Saputra, B.Sc
$6.00

by Prof. Dr. N. Driyarkara, SJ
$6.00

by P. Suhardiman
$6.00