by Ir. Kaslan A. Tohir
$12.00

by Brian Bolt
$5.00

by Dr. Ir. Akhmad Fauzi, M.Sc. & Dr. Dra. Suzy Anna, M.Si
$12.00

by George A.M. Farland
$9.00

by Drs. Amin Widjaja Tunggal, Ak., M.B.A
$7.00

by Eddy Tano, Dipl. Chem. Eng.
$9.00