by Thomas Keating $3.00
by Kuswandi $6.00
by Ir. H. Rahmat Rukmana $6.00
by R.P.S. Padmobusono $3.00
by Ir. Abbas Siregar Djarijah & Ir. Harsono Puspowardoyo $5.00
by Ir. M. Lies Suprapti $7.00