Cita APA (7th ed.)

Howgate, G. W. (1971). George Santayana. Russell & Russell.

Cita Chicago (17th ed.)

Howgate, George W. George Santayana. New York: Russell & Russell, 1971.

Cita MLA (9th ed.)

Howgate, George W. George Santayana. Russell & Russell, 1971.