by J. I. G. M. Drost, SJ $7.00
by Tim Pustaka Familia $6.00
by Prof. Dr. Suhartono $9.00
by Ir. Fauziah Muhlisah $6.00
by Ir. Moehar Daniel, M.S & Ir. Darmawati, M.Sc & Ir. Nieldalina, M.Si $7.00
by Anthony Harton $4.00