by Prof. Dr. Umar Tirtarahardja dan Drs. La Sula
$12.00

by Drs. Paulus Hariyono, M.T
$9.00

by Prof. Dr. Makmur, M.Si
$7.00

by Herbert G. Hick dan G. Ray Gullet
$20.00

by Sanapiah Faisal
$9.00

by Dr. Arthur M. Whitehill
$7.00