by Prof. Dr. Oemar Hamalik $9.00
by Prof. H.M. Arifin, M.Ed $7.00
by Prof. Dr. Suharsimi Arikunto $13.00
by Prof. Dr. Suharsimi Arikunto $11.00
by Dr. H. Abuddin Nata, MA $6.00
by Drs. Daryanto $6.00