APA (7th ed.) Citation

Einstein, A., & Lawson, R. W. (2011). Relativity: The Special and the General Theory A Popular Exposition, 3rd ed. Project Gutenberg.

Chicago Style (17th ed.) Citation

Einstein, Albert, and Robert W. Lawson. Relativity: The Special and the General Theory A Popular Exposition, 3rd Ed. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Einstein, Albert, and Robert W. Lawson. Relativity: The Special and the General Theory A Popular Exposition, 3rd Ed. Project Gutenberg, 2011.

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