Schillp, P. A., & Friedman, M. (1967). The philosophy of Martin Buber: Ed. by Paul Arthur Schillp and Maurice Friedman. Open Court.

Schillp, Paul Arthur, and Maurice Friedman. The Philosophy of Martin Buber: Ed. by Paul Arthur Schillp and Maurice Friedman. La Salle [u.a.]: Open Court, 1967.

Schillp, Paul Arthur, and Maurice Friedman. The Philosophy of Martin Buber: Ed. by Paul Arthur Schillp and Maurice Friedman. Open Court, 1967.