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(1965). The philosophy of Edmund Husserl: The origin and development of his phenomenology, Octagon books, New York.

(1941). The philosophy of Edmund Husserl: The origin and development of his phenomenology, Columbia University Press, New York.

(1940). Edmund Husserl: An appreciation. The Personalist 21, pp. 159-166.

(1939). Edmund Husserl's phenomenology, University of Southern California, Los Angeles.