by Drs. O.P. Simorangkir $9.00
by Dennis Linn, dkk $6.00
by Prof. Dr. Suharsimi Arikunto $11.00
by Drs. H. Kahar Masyhur $16.00
by Dr. Abdullah Nashikh Ulwan $6.00
by DR. Farida Yusuf Tayibnapis, M.Pd $7.00