APA (7th ed.) Citation

Otto, R., Morrison, W. D., Thomson, J. A., & Thomson, M. R. (2009). Naturalism And Religion. Project Gutenberg.

Chicago Style (17th ed.) Citation

Otto, Rudolf, William Douglas Morrison, J. Arthur Thomson, and Margaret R. Thomson. Naturalism And Religion. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Otto, Rudolf, et al. Naturalism And Religion. Project Gutenberg, 2009.

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