APA (7th ed.) Citation

Allen, G. (1931). The evolution of the idea of God. The Thinker's library.

Chicago Style (17th ed.) Citation

Allen, Grant. "The Evolution of the Idea of God." The Thinker's Library 1931.

MLA (9th ed.) Citation

Allen, Grant. "The Evolution of the Idea of God." The Thinker's Library, 1931.

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