by Drs. Robinson Tarigan, M.R.P
$11.00

by Ir. Bambang Cahyono
$6.00

by Y. Sri Pudyatmoko
$9.00

by Prof. drh. Charles Rangga Tabbu, M.Sc., Ph.D
$13.00

by Ir. Hieronymus Budi Santoso
$5.00

by Roger Hamilton
$7.00