by E. Martasudjita, Pr. $3.00
by H. Rahmat Rukmana $6.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $6.00
by Ir. Abbas Siregar Djarijah $5.00
by Nursalam $12.00
by Ir. H. Rahmat Rukmana, MBA., MSc. $5.00