by Bruce Herrick dan Charles P. Kindleberger
$12.00

by Soejono Trimo, MLS
$7.00

by Drs. Ahsin W. Al-Hafidz
$6.00

by Ir. Abbas Siregar Djarijah
$6.00

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

by Drs. Solichin Abdul Wahab, M.A
$7.00