by Petra Widmer & Heinz Frick $5.00
by H. Rahmat Rukmana $6.00
by dr. Endang Lanywati $5.00
by Ir. Loekas Soesanto, M.S., Ph.D $11.00
by Ir. Rudy Gunawan $6.00
by Adi Gunawan $6.00