"The book is well worth reading..." International Studies in Philosophy
"This book is destined to replace Kant as the ultimate formulation of Kantian ethics. It should be required reading for any philosopher and should be in every library." W.F. Desmond, Choice
"This is a book anyone working in ethics should have on the desk. It is provocative and makes original and major contributions to a defense of a Kantian ethic. The historical developments of the various strands of thought are traced out in clear and helpful style. Korsgaard's writing is itself engaging and clear and her arguments forceful and for the most part compelling. This book constitutes a major advance in ethical theory." L. W. Colter, Review of Metaphysics
Ethical concepts are, or purport to be, normative and make claims on us. This text identifies and examines four accounts of the source of normativity that have been advocated by modern moral philosophers-SHvoluntarism, realism, reflective endorsement, and the appeal to autonomy.