by Edilius, S.E., dkk
$9.00

by Ir. Sujamto
$7.00

by Dr. Ir. Muhammad Rasyaf, MS
$11.00

by Benyamin Lakitan
$7.00

by Ny. Susmayati, B.A dan Ny. Hj. Asnidar
$7.00

by Ir. Abbas Siregar Djarijah & Ir. Harsono Puspowardoyo
$5.00