00373nam a22001577a 450000100060000000300100000600500170001604000140003300800410004702000180008810000180010624500370012426000290016130000110019065000140020110350MX-SIABUC20260702204151.0 aMX-SIABUC050612s1990 enkx j eng d a0-14-013558-840aMackie, J. L.0 aEthics inventing right and wrong4 aLondres :bPenguin Books4 a249 p. a1.EĢTICA