APA (7th ed.) Citation

Santayana, G. (1954). The life of reason, or, The phases of human progress / by G. Santayana. Constable.

Chicago Style (17th ed.) Citation

Santayana, G. The Life of Reason, or, The Phases of Human Progress / by G. Santayana. Constable, 1954.

MLA (9th ed.) Citation

Santayana, G. The Life of Reason, or, The Phases of Human Progress / by G. Santayana. Constable, 1954.

Warning: These citations may not always be 100% accurate.