[1] Luke Russell,“Two Kinds of Normativity:Korsgaard v. Hume”,in Hume on Motivation and Virtue[M].ed. by Charles R. Pigden.(Hampshire:Palgrave Macmillan,2009. [2] Christine Korsgaard,The Sources of Normativity[M].Cambridge:Cambridge University Press,1996. [3] Immanuel Kant,Groundwork of the Metaphysics of Morals (Cambridge Texts in the History of Philosophy)[M].Translated and edited by Mary Gregor with an Introduction by Christine M. Korsgaard. Cambridge:Cambridge University Press,1998. [4] Luke Russell.“Two Kinds of Normativity:Korsgaard v. Hume”,in Hume on Motivation and Virtue[M].ed. by Charles R. Pigden. Hampshire:Palgrave Macmillan,2009. [5] Christine Korsgaard,The Constitution of Agency:Essays on Practical Reason and Moral Psychology[M].New York:Oxford University Press,2008.