by Ir. Heinz Frick & LMF. Purwanto $6.00
by Ir. Hieronymus Budi Santoso $5.00
by Soekartawi $5.00
by Ir. Suprio Guntoro $6.00
by Andrianus Meliala $7.00
by Ir. Lisdiana Fachruddin $5.00