by Prof. Mr. Dr. Sudargo Gautama
$6.00

by A. Widyamartaya, B.A
$4.00

by Kasmir, S.E., M.M
$9.00

by Staton Robin
$7.00

by M.B. Iman Santoso, S.Ag.
$6.00

by Ir. M. Lies Suprapti
$5.00