APA (7th ed.) Citation

Santayana, G. (1962). The life of reason or the phases of human progress. Collier.

Chicago Style (17th ed.) Citation

Santayana, George. The Life of Reason or the Phases of Human Progress. Nueva York: Collier, 1962.

MLA (9th ed.) Citation

Santayana, George. The Life of Reason or the Phases of Human Progress. Collier, 1962.