by Drs. Ary H. Gunawan
$11.00

by Prof. Dr. Sondang P. Siagian, M.P.A
$9.00

by Djamaluddin Darwis
$7.00

by P. A. Elliot
$9.00

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

by Redjo Mudyahardjo
$13.00