by Robert Heilbronner
$6.00

by Prof. Dr. Husaini Usman, M.Pd & R. Purnomo Setiady Akbar, S.Pd., M.Pd
$11.00

by Dr. Paul Suparno, SJ.
$6.00

by Drs. Abdullah Ali, Drs. Misbandono, dan Ir. Eny Rahma
$7.00

by Prof. Dr. Mahmud Syaltut
$11.00

by Prof. Dr. Sondang P. Siagian, M.P.A
$11.00