APA (7th ed.) Citation

Santayana, G., & Holzberger, W. G. (2003). The letters of George Santayana (Santayana ed.). MIT Press.

Chicago Style (17th ed.) Citation

Santayana, George, and William G. Holzberger. The Letters of George Santayana. Santayana ed. Cambridge, Mass.: MIT Press, 2003.

MLA (9th ed.) Citation

Santayana, George, and William G. Holzberger. The Letters of George Santayana. Santayana ed. MIT Press, 2003.