„despite many individual exceptions, Humanists have on the whole been unable to free themselves from one of the most central... Christian dogmas: the prejudice of speciesism”. Źródło: Peter Singer:Taking Humanism Beyond Speciesism, by Peter Singer.[dostęp 2007-01-11].[zarchiwizowane z tego adresu(2011-05-22)].
„despite many individual exceptions, Humanists have on the whole been unable to free themselves from one of the most central... Christian dogmas: the prejudice of speciesism”. Źródło: Peter Singer:Taking Humanism Beyond Speciesism, by Peter Singer.[dostęp 2007-01-11].[zarchiwizowane z tego adresu(2011-05-22)].