by Totok Semartho Wiryasaputra $6.00
by Ir. H. Rahmat Rukmana, MBA., M.Sc. & Uu Sugandi Saputra, B.Sc $6.00
by Ir. M. Lies Suprapti $6.00
by Darminta, J, SJ $4.00
by Thomas Hidya Tjaya $6.00
by Ir. Kaslan A. Tohir $9.00