by Prof. Dr. Sondang P. Siagian, M.P.A $9.00
by J. Price Gittinger $6.00
by Drs. Abdulsyani $9.00
by Prof. Moeljatno, S.H $7.00
by Prof. J. Suprapto, M.A. APU $11.00
by $6.00
by Drs. Ibnu Syamsi, S.U $9.00