Recommended reading for Lee's seminar on Kantian Ethics

Grounding 1

On whether there is moral worth only in actions done from the motive of duty:

• Judith Baker, "Do One's Motives have to be Pure?" in Richard E. Grandy & Richard Warner, eds., Philosophical Grounds of Rationality: Intentions, Categories, Ends (Clarendon, 1986)
• Paul Guyer, "Duty and Inclination" chapter 10 of Kant and the Experience of Freedom (Cambridge, 1993), especially section I
• Marcia Baron, "The Alleged Moral Repugnance of Acting from Duty" The Journal of Philosophy 81 (1984) [more on arguments about the issue than about interpretation of Kant as such]

• Mark timmons, "Kant's Strategy in the Ethical Works: The Construction of a Rationalist Internalism" Southwest Philosophical Studies 8#1 (1982) pp. 103-111