by Tung Desem Waringin $13.00
by Prof. Dr. Sukardi, Ph.D $9.00
by Untung Sukardji $12.00
by Ir. M. Iqbal Hasan $11.00
by Ir. Endar Sugiarto, BA, Sri Sulartiningrum, BA $7.00
by Ir. Moehar Daniel, M.S $7.00