by Lawrie, R.A $16.00
by Aloys Budi Purnomo, Pr. $4.00
by Theo Riyanto, FIC $6.00
by Dr. Ir. Kemas Ali Hanafiah, M.S., dkk $7.00
by H. Rahmat Rukmana $5.00
by A. Margana $6.00