by H. Rahmat Rukmana $5.00
by Ir. Hatta Sunanta, B.Sc., MS $6.00
by Arsanto, dkk. $6.00
by Muhammad Chirzin $5.00
by N. Edy Soetanto, BE. $5.00
by Drs. M. Sastrapratedja $11.00
by Ir. Ibnu Dwi Buwono, M.Si $7.00