00329nam a2200157 a 4500041000800000082001400008100001800022245002100040260004700061300001000108650001000118650001700128650000900145650000900154650000800163 aspa a170bS353 aSinger, Peter aEtica práctica aGran BretañabCambridge Universityc1995 a492 p aETICA aETICA SOCIAL aVIDA aBIEN aMAL