by T. Sarpian $7.00
by Ir. Hatta Sunanta, B.Sc., MS $5.00
by Ir. Abbas Siregar Djarijah $6.00
by Ir. Heinz Frick & Pujo L. Setiawan $7.00
by Ir. Hieronymus Budi Santoso dan Heru Respati $5.00
by Budi Santoso $6.00
by - $5.00