APA (7th ed.) Citation

Santayana, G. (2010). Character and Opinion in the United States. Project Gutenberg.

Chicago Style (17th ed.) Citation

Santayana, George. Character and Opinion in the United States. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Santayana, George. Character and Opinion in the United States. Project Gutenberg, 2010.

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