by Dr. B. Siswanto Sastrohadiwiryo
$12.00

by Dr. Oemar Hamalik
$7.00

by Drs. Husein Umar, S.E., M.M., MBA
$13.00

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

by M. Ali Hasan
$9.00

by George D. Halsey
$11.00