by WK $12.00
by Ir. G. Djatmiko Sudarmo & Ir. S. J. Edy Purnomo $12.00
by Ulrich $16.00
by Ir. H. Rahmat Rukmana, MBA $5.00
by Drs. Hari Amanto & Drs. Daryanto $7.00
by Ir. Dedy Heryadi Sutisna, MS & Ratno Sutarmanto $6.00