APA (7th ed.) Citation

Marshall, G., & Poling, D. (1971). Schweitzer: A biography. Doubleday.

Chicago Style (17th ed.) Citation

Marshall, George, and David Poling. Schweitzer: A Biography. Garden City, N.Y: Doubleday, 1971.

MLA (8th ed.) Citation

Marshall, George, and David Poling. Schweitzer: A Biography. Doubleday, 1971.