Beck, Lewis White, Early German Philosophy. Kant and His Predecessors, Cambridge, MA: Harvard University Press, 1969.
Books
The Bounds of Sense: An Essay on Kant’s Critique of Pure Reason
Strawson, P.F., The Bounds of Sense: An Essay on Kant's Critique of Pure Reason, London: Methuen, 1966.
Kant’s Theory of Mental Activity
Wolff, Robert Paul, Kant's Theory of Mental Activity, Cambridge, Mass: Harvard University Press, 1963.
Laws of Freedom: A Study of Kant’s Method of Applying the Categorical Imperative in the Metaphysik der Sitten
Gregor, Mary, Laws of Freedom: A Study of Kant's Method of Applying the Categorical Imperative in the Metaphysik der Sitten, Oxford: Basil Blackwell, 1963.
A Commentary on Kant’s Critique of Practical Reason
Beck, L., A Commentary on Kant's Critique of Practical Reason, Chicago and London: University of Chicago Press, 1960.