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

by Drs. H. Abu Ahmadi
$9.00

by Dra. L. Simanjuntak
$9.00

by Dr. Iskandar Zulkarnain
$9.00

by Prof. Dr. Suharsimi Arikunto
$11.00

by Redjo Mudyahardjo
$13.00