APA (7th ed.) Citation

Santayana, G. (2011). Three Philosophical Poets Lucretius, Dante, and Goethe. Project Gutenberg.

Chicago Style (17th ed.) Citation

Santayana, George. Three Philosophical Poets Lucretius, Dante, and Goethe. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Santayana, George. Three Philosophical Poets Lucretius, Dante, and Goethe. Project Gutenberg, 2011.

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