by Dr. A. Supratiknya $6.00
by Ir. Ari Wijayani Purwanto $9.00
by Amatullah Shafiyyah & Haryati Soeripno $6.00
by Ir. Nur Tjahjadi $5.00
by Dr. Ir. M\'Imadduddin Abdul Rahim, M.Sc $6.00
by J. Donald Walters $3.00