by Dr. Abd El-Affendi Wahab
$6.00

by Asep Burhanuddin
$7.00

by Drs. H. Fuad Ihsan
$9.00

by Drs. Ad. Rooijakkers
$5.00

by Prof. Dr. Suharsimi Arikunto
$13.00

by Dr. Hj. Fathul Djannah SH
$6.00