by Prof. Dr. Oemar Hamalik $9.00
by Drs. Hari Amanto & Drs. Daryanto $7.00
by Dr. Ibrahim Madkour $11.00
by Drs. Amin Widjaja Tunggal, Ak., M.B.A $6.00
by ISEI $26.00
by Laurence Haughton $11.00