by Prof. DR. H. Abdul Muis Ba'dulu & Hermann, S.Ag., M.Pd
$7.00

by Drs. G. Kartasapoetra
$12.00

by Drs. R. Suharno
$6.00

by Drs. H. Abu Ahmadi
$11.00

by Radiks Purba
$13.00

by Dr. Ir. Akhmad Fauzi, M.Sc
$9.00