by Ir. Arif Hartoyo, M. S $5.00
by Ir. H. Rahmat Rukmana, MBA., MSc. $5.00
by St. Gitowiratmo, Pr. $4.00
by J. Bulatau, SJ $5.00
by Muhammad Chirzin $5.00
by Prof. drh. Charles Rangga Tabbu, M.Sc., Ph.D $13.00