by Prof. Ir. Zoer'ani Djamal Irwan, M.Sc $7.00
by Drs. Suyadi Prawirosentono, MBA $11.00
by Sei H. Dt. Tombak Alam $5.00
by Prof. Dr. S. Nasution, M.A. $9.00
by Drs. Agus Sujanto, dkk $9.00
by Michael P. Todaro $12.00