Vgl. Don Marquis: Why Abortion is Immoral. In: The Journal of Philosophy. Band 86, Nr.4 (April 1989), S. 183–202; e-Text, abweichende Seitenzählung (PDF; 4,8MB).
Singer: „I don’t think you can rationally prove an answer for everyone irrespective of their nature and their preferences, that shows that it’s always rational for them to be moral.“ (Video, 2:17–2:28)