APA (7th ed.) Citation

Schilpp, P. A., & Santayana, G. (1940). The philosophy of George Santayana. Northwestern university.

Chicago Style (17th ed.) Citation

Schilpp, Paul Arthur, and George Santayana. The Philosophy of George Santayana. Evanston and Chicago: Northwestern university, 1940.

MLA (8th ed.) Citation

Schilpp, Paul Arthur, and George Santayana. The Philosophy of George Santayana. Northwestern university, 1940.

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