by Soedjito Tjokrowisastro $12.00
by Ir. H. Rahmat Rukmana, MBA., M.Sc. & Uu Sugandi Saputra, B.Sc $6.00
by Bambang Agus Murtidjo $6.00
by Anggorodi, R $6.00
by Dr. Sayidd Al-Jumaili $7.00
by P. Suhardiman $6.00