APA (7th ed.) Citation

Santayana, G. (1930). The realm of matter.: Book second of Realms of being. Scribner.

Chicago Style (17th ed.) Citation

Santayana, George. The Realm of Matter.: Book Second of Realms of Being. New York: Scribner, 1930.

MLA (9th ed.) Citation

Santayana, George. The Realm of Matter.: Book Second of Realms of Being. Scribner, 1930.

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