by Prof. Dr. Burhanuddin Salam, M.M
$7.00

by Drs. CST. Kansil, S.H
$11.00

by Prof. Dr. Sondang P. Siagian, M.P.A
$7.00

by Mana'ul Quthan, Terj. Halimuddin, S.H
$9.00

by Maesaroh D. Mansur, S.Pd
$6.00

by Kusno Budi Santoso dan S. Ary Soewendo
$11.00