Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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