by Ir. Rabiatual Adawyah, M.P $7.00
by Ir. Abbas Siregar Djarijah & Ir. Harsono Puspowardoyo $5.00
by F.W. Dillistone $9.00
by Haryoto $5.00
by Ir. H. Rahmat Rukmana $6.00
by Henri J. M. Nouwen $3.00