by Damsar $7.00
by Prof. Dr. Sirajuddin Zar $9.00
by Ir. Moehar Daniel, M.S & Ir. Darmawati, M.Sc & Ir. Nieldalina, M.Si $7.00
by Masyhud Ali $22.00
by $12.00
by Gunawan Widjaja, A. Yani $7.00