by Ir. M. Lies Suprapti $6.00
by Abu Ubaidah Al Walid $6.00
by Ir. Heinz Frick $6.00
by Drs. Syafi'in Mansur $6.00
by Th. Aq. M. Rochadi Widagdo, Pr $6.00
by M. Fauzil Adhim $7.00