by Untung Sukardji $12.00
by Prof. Dr. Ir. Ali Khomsan $9.00
by M. Ali Hasan $9.00
by Ir. Setijo Pitojo $7.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $6.00
by Ir. Ari Wijayani Purwanto $9.00