by $4.00
by Deliarnov $11.00
by Th. Aq. M. Rochadi Widagdo, Pr. $6.00
by Ir. Hieronymus Budi Santoso $5.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $7.00
by Prof. Dr. Kees Bertens, MSC $9.00
by Bhisma Murti $7.00