APA (7th ed.) Citation

Allen, R. E. (1966). Greek philosophy: Thales to Aristotle. The Free press.

Chicago Style (17th ed.) Citation

Allen, Reginald E. Greek Philosophy: Thales to Aristotle. New York: The Free press, 1966.

MLA (9th ed.) Citation

Allen, Reginald E. Greek Philosophy: Thales to Aristotle. The Free press, 1966.