by Drs. Ad. Rooijakkers $5.00
by Prof. Dr. Suharsimi Arikunto $6.00
by Sudirman Tebba $5.00
by Hardius Usman $6.00
by Thomas Ballantine Irving $6.00
by Joe Luxbacher $7.00
by Dr. H. Abuddin Nata, MA $7.00