1. D. W. Sherburne, A Key to Whitehead’s Process and Reality (Bloomington, Ind.: Indiana University Press, 1971) p. 207.
2. W. Christian, An Interpretation of Whitehead’s Metaphysics (New Haven, Conn.: Yale University Press, 1959) pp. 380–1.
3. Kenneth W. Morgan, ed., The Path of the Buddha (New York: The Ronald Press Company, 1956) p. 47.