by Drs. C. I. Bc. Harsono Hs IP
$5.00

by Subba Rao, N.S
$7.00

by Hilman Hariwijaya & Boim Lebon
$6.00

by
$6.00

by Prof. Dr. Suharsimi Arikunto, dkk
$7.00

by Prof. Dr. J. Winardi, SE
$9.00