by Charles V. Gerkin
$7.00

by H. Rahmat Rukmana
$5.00

by dr. Endang Lanywati
$5.00

by Ir. Rabiatual Adawyah, M.P
$7.00

by Ir. Heinz Frick & Pujo L. Setiawan
$7.00

by Suharso, A.S.P
$6.00