by Muhammad Chirzin $5.00
by Iskandar Kanna, A.Md $7.00
by Prof. Dr. Sri Mulyani E. S $12.00
by Ir. H. Rahmat Rukmana $5.00
by G. Budi Subanar, SJ. $6.00
by Ir. Dede Juanda J.S. & Ir. Bambang Cahyono $6.00