by A. Widyamartaya, B.A $3.00
by Dr. Ir. Muhammad Rasyaf, MS $7.00
by Rumsari Hadi Sumarto & Lukas Dwiantara $7.00
by Anthony T. Padovano, Dr. $6.00
by Ir. Dede Juanda J.S. & Ir. Bambang Cahyono $6.00
by WK $12.00