by Ressang, A.A $6.00
by Dr. Ir. Muhammad Rasyaf, MS $7.00
by Ir. Suprio Guntoro $5.00
by Ir. Sumeru Ashari, M.A gr. Sc $7.00
by Bambang Agus Murtidjo $6.00
by Edwar Djamaris $8.00