by Ir. Setijo Pitojo
$6.00

by Ir. Hatta Sunanta, B.Sc., MS
$5.00

by Djoehana Setyamidjaja, M.Ed
$7.00

by Dr. Ir. Muhammad Rasyaf, MS
$9.00

by Ir. Hieronymus Budi Santoso
$5.00

by J. Robert Starratt
$7.00