by Michael P. Todaro $16.00
by Robert P. Masland $7.00
by Drs. Wasty Soemanto, M.Pd $6.00
by Prof. Dr. S. Nasution, M.A. $7.00
by Drs. Abdulsyani $9.00
by Prof. Dr. Suharsimi Arikunto, dkk $7.00