APA Style

Collins, J, 1. (1969). Crossroads in philosophy: existentialism, naturalism, theistic realism (1st Gateway Ed.). Chicago: Henry Regnery Company.

MLA Style

Collins, James,, 1917-1985. "Crossroads in philosophy: existentialism, naturalism, theistic realism". 1st Gateway Ed. Chicago: Henry Regnery Company, 1969. Text.