by Ir. M. Iqbal Hasan $9.00
by Zulkarimein Nasution $9.00
by Dibyo S. Priambodo $7.00
by Herbert G. Hick dan G. Ray Gullet $20.00
by Mohamad Sobary $9.00
by Paulus Florus $12.00
by Winarno Msi $3.17