by Ir. Daisy P. Sriyadi Hendaryono $6.00
by Ranakusuma, Boedisantoso $6.00
by Ir. Pracaya $6.00
by Nursalam $9.00
by Ir. Juhaeni Radi $0.00
by Prof. dr. D. Bachtiar Lubis, dr. Sylvia D. Elvira $7.00