APA (7th ed.) Citation

Tillyard, E. M. W., & Lewis, C. S. (1939). The personal heresy: A controversy. Oxford university press.

Chicago Style (17th ed.) Citation

Tillyard, E. M. W., and C. S. Lewis. The Personal Heresy: A Controversy. London, New York [etc.]: Oxford university press, 1939.

MLA (9th ed.) Citation

Tillyard, E. M. W., and C. S. Lewis. The Personal Heresy: A Controversy. Oxford university press, 1939.