Frey, R. G. & Paton, William (1989) “Vivisection, morals and medicine: An exchange”, en Regan, T. & Singer, P. (eds.) Multi Marrón Asas Bolso Conjunto Adivinar De Vikky ARxwvZqAnimal rights and human obligations, Englewood Cliffs: Prentice Hall, pp. 223-226.
McMahan, J. (2002) The ethics of killing: Problems at the margins of lifeLa Instigador Verde Norte Cara Mochila rHwYpfrq, Oxford: Oxford University Press.