Whitehead and the Rise of Modern Logic, W.V. Quine; Whitehead's Philosophy of Science, F.S.C. Northrop; Space-Time, Simple Location, and Prehension, E.B. McGilvary; A Biologist's View of Whitehead's Philosophy, Joseph Needham; Whitehead's Philosophy of Language and Its Relation to His Metaphysics, W.B. Urban; Whitehead's Defence of Speculative Reason, A.D. Ritchie; Whitehead and the Method of Speculative Philosophy, Arthur E. Murphy; Whitehead on Mind and Nature, W.E. Hocking; Philosophy of Organism and Physical Realism, R.W. Sellars; Whitehead's Philosophy of Religion, J.S. Bixler; Whitehead's Idea of God, Charles Hartshorne; Whitehead's Moral Philosophy, P.A. Schilpp; Whitehead's Views on Education, H.W. Holmes; The Philosophy of Whitehead, John Dewey; The Categories of Natural Knowledge, C.I. Lewis; The Philosopher's Summary, Alfred North Whitehead.