by Haryoto $5.00
by Michaelene Mundy $6.00
by Ir. G. Djatmiko Sudarmo & Ir. S. J. Edy Purnomo $11.00
by Dr. Sofyan Syafri Harahap, M.S,Ac $7.00
by Freddy Rangkuti $12.00
by Ir. Bambang Cahyono $7.00