by Ir. Abbas Siregar Djarijah & Nunung Marlina Djarijah $6.00
by Ir. Suprio Guntoro $5.00
by Karwan A. Salikin $7.00
by Y. T. Prasetiyo $5.00
by Ir. H. Rahmat Rukmana $6.00
by Agus S. Gunadi $9.00