APA (7th ed.) Citation

Santayana, G., & Holzberger, W. G. (2006). The letters of George Santayana. MIT Press. https://doi.org/10.7551/mitpress/4208.001.0001

Chicago Style (17th ed.) Citation

Santayana, George, and William G. Holzberger. The Letters of George Santayana. Cambridge, Mass.: MIT Press, 2006. https://doi.org/10.7551/mitpress/4208.001.0001.

MLA (9th ed.) Citation

Santayana, George, and William G. Holzberger. The Letters of George Santayana. MIT Press, 2006. https://doi.org/10.7551/mitpress/4208.001.0001.