APA (7th ed.) Citation

Santayana, G. (1940). The realm of spirit.: Book fourth of Realms of being. C. Scribner's sons.

Chicago Style (17th ed.) Citation

Santayana, George. The Realm of Spirit.: Book Fourth of Realms of Being. New York: C. Scribner's sons, 1940.

MLA (9th ed.) Citation

Santayana, George. The Realm of Spirit.: Book Fourth of Realms of Being. C. Scribner's sons, 1940.

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