by K. Usman $5.00
by M. Aziz Toyibin dan A. Kosasih Djahiri $12.00
by Drs. Amin Wijaja Tunggal, M.B.A $11.00
by Mansur Samin $6.00
by Dra. L. Simanjuntak $9.00
by Prof. Dr. Sondang P. Siagian, M.P.A $9.00