by Seyyed Hosein $5.00
by Ir. F.X. Susanto Tumpal HS. Siregar $5.00
by Ir. Abbas Siregar Djarijah $6.00
by Ir. Hatta Sunanta, B.Sc., MS $5.00
by Ir. Setijo Pitojo $6.00
by Gerald Davidson $43.00
by Prof. Dr. H.A.R. Tilaar, MSc.Ed $9.00