by Drs. S. Margono
$9.00

by Dr. Nur Syam
$11.00

by Drs. Abdullah Ali, Drs. Misbandono, dan Ir. Eny Rahma
$7.00

by Dra. Roestiyah NK
$6.00

by Dr. Abu Yasid
$6.00

by Syahrin Harahap
$9.00