by Dr. Ir. Muhammad Rasyaf, MS $9.00
by Made Astawan & Andreas Leomitro Kasih $12.00
by L. Prasetya, Pr. $6.00
by Kemas Ali Hanafiah $9.00
by Ir. H. Rahmat Rukmana, MBA., MSc. $5.00
by Thomas A. N. S $6.00