by WK $16.00
by Ir. M. Lies Suprapti $6.00
by Ir. R. Bambang Soelarso $6.00
by Raldi Artono $18.00
by Prof. Dr. Zuhal M.Sc.EE & Ir. Zhanggischan $36.00
by H. Rahmat Rukmana $5.00