by Ir. H. Rahmat Rukmana, MBA., MSc. $5.00
by Mary Evelyn Tucker & John A. Grim $11.00
by $0.00
by Ir. Nur Tjahjadi $5.00
by Prof. Dr. Soekartawi $6.00
by Ir. Hatta Sunanta, B.Sc., MS $6.00