Cita APA (7a ed.)

Santayana, G., & Henfrey, N. (1968). Selected Critical Writings. University Press.

Cita Chicago Style (17a ed.)

Santayana, George, y Norman Henfrey. Selected Critical Writings. Cambridge: University Press, 1968.

Cita MLA (9a ed.)

Santayana, George, y Norman Henfrey. Selected Critical Writings. University Press, 1968.