by Frianto Pandja, S.E $11.00
by Djamin, Zulkarnain $6.00
by Baum, Warren C & Stokes M. Tolbert $7.00
by Drs. Husein Umar, S.E., M.M., MBA $9.00
by M. Ali Hasan $6.00
by A.H. Manurung, S.E $6.00