Reference: Frankfurt, Harry G. "Alternate Possibilities and Moral Responsibility." The Journal of Philosophy, Vol. 66, No. 23. (Dec. 4, 1969), pp. 829-839.

Link to article: http://links.jstor.org/sici?sici=0022-362X(19691204)66:23<829:APAMR>2.0.CO;2-E
Alternative link: http://spot.colorado.edu/~kaufmad/courses/Frankfurt.pdf
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