by J. Donald Walters $5.00
by Ir. H. Rahmat Rukmana, MBA., MSc. $5.00
by Dr. Ronald Hutapea, SKM, Ph.D $6.00
by Judith Swarth, M.S., R.D $6.00
by $3.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $7.00