by A. Tresna Sastrawijaya, M.Sc $7.00
by Prof. Dr. Sudarwan Danim $9.00
by Dra. Nurul Zuriah, M.Si $11.00
by Prof. Dr. S. Nasution, M.A. $7.00
by Peter H. Lindert $26.00
by Drs. Daryanto $7.00