APA (7th ed.) Citation

Santayana, G. (2001). The letters of George Santayana. The letters of George Santayana.

Chicago Style (17th ed.) Citation

Santayana, George. "The Letters of George Santayana." The Letters of George Santayana 2001.

MLA (8th ed.) Citation

Santayana, George. "The Letters of George Santayana." The Letters of George Santayana, 2001.

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