by Herlina Suyati Bachtiar
$7.00

by Arief Sardiman, dkk
$11.00

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

by Dr. Soekartawi
$6.00

by Zairin Harahap
$9.00

by Prof. Dr. S. Nasution, M.A.
$7.00