by J. Donald Walters $3.00
by Ir. H. Rahmat Rukmana, MBA., MSc. $6.00
by Ir. Ari Wijayani Purwanto $11.00
by Alex Lanur, OFM $6.00
by RW. Allard $11.00
by Ir. Fauziah Muhlisah $6.00