by Ir. H. Rahmat Rukmana, MBA., MSc. $5.00
by Sakti A. Siregar $6.00
by $4.00
by Dra. Wiwi Isnaeni, M.S $11.00
by Andang Priadi S. M $5.00
by Ir. Sumeru Ashari, M.A gr. Sc $7.00