Before revision: Different versions of this argument have been put forward by Peter Singer,Animals and Ethics – Internet Encyclopedia of Philosophy Tom Regan,Regan, Tom "An examination and defense of one argument concerning animal rights", Inquiry: An Interdisciplinary Journal of Philosophy 22, 1979, 189–219 Evelyn Pluhar,Pluhar, E. Beyond Prejudice: The Moral Significance of Human and Nonhuman Animals, Durham: Duke University Press, 1995 and Oscar Horta.Horta, Oscar.
After revision: Different versions of this argument have been put forward by Peter Singer,Animals , Ethics – Internet Encyclopedia of Philosophy Tom Regan,Regan, Tom "An examination and defense of one argument concerning animal rights", Inquiry: An Interdisciplinary Journal of Philosophy 22, 1979, 189–219 Evelyn Pluhar,Pluhar, E. Beyond Prejudice: The Moral Significance of Human and Nonhuman Animals, Durham: Duke University Press, 1995 and Oscar Horta.Horta, Oscar.