by Andrianus Meliala $7.00
by J. Donald Walters $3.00
by Ir. Daisy P. Sriyadi Hendaryono, M.Si & Ir. Ari Wijayani $6.00
by Ir. FX. Susanto $7.00
by Heryanto $5.00
by Don Campbell $11.00
by Dr. Al. Purwa Hadiwardoyo, MSF. $4.00