by Ir. Lisdiana Fachruddin $6.00
by Istimawan Dipohusodo $13.00
by Ir. Heinz Frick $7.00
by J. Donald Walters $3.00
by B. U. Hadikusumo $6.00
by Ir. H. Rahmat Rukmana, MBA., M.Sc. & Uu Sugandi Saputra, B.Sc $6.00