„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)].