by Prof. Dr. Louis Leahy, SJ
$11.00

by Dr. Ir. Kemas Ali Hanafiah, M.S., dkk
$11.00

by Gutomo Priyatmono
$12.00

by H. Rahmat Rukmana
$5.00

by Drs. Agus M. Hardjana, M.Sc., Ed
$6.00

by E. Martasudjita, Pr.
$9.00