by Dr. W. Herdin Sibuea., dkk $7.00
by Prof. DR. Taliziduhu Ndraha $7.00
by Drs. Daryanto $7.00
by Benny Susetyo $7.00
by Prof. Dr. H. Abuddin Nata, M.A $11.00
by Pandji Anoraga, S.E, M.M $6.00