by Ir. G. Djatmiko Sudarmo & Ir. S. J. Edy Purnomo $12.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $7.00
by Bachtiar Ibrahim $12.00
by Drs. Daryanto $6.00
by WK $16.00
by Malvino $20.00