by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Prof. Dr. Machasin MA (ed.) $7.00
by Murad Wilfred Hoffman $7.00
by Drs. H. Kahar Masyhur $11.00
by Sidney Callahan $7.00
by Drs. Inu Kencana Syafiie $9.00