by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by Thabrani $12.00
by Katili, Irwan $13.00
by Ny. Susmayati, B.A dan Ny. Hj. Asnidar $7.00
by Drs. Daryanto $11.00
by WK $12.00