by $7.00
by Fachruddin M. Mangunjaya $6.00
by Lester R. Brown $21.00
by Pandji Anoraga, S.E., M.M dan H. Djoko Sudantoko, S.Sos., M.M $13.00
by Taufik Amir $11.00
by Drs. R. Martino $6.00
by Suhardjo $6.00