APA (7th ed.) Citation

Smith, G. O. (2006). The Fourth "R". Project Gutenberg.

Chicago Style (17th ed.) Citation

Smith, George O. The Fourth "R". Project Gutenberg, 2006.

MLA (9th ed.) Citation

Smith, George O. The Fourth "R". Project Gutenberg, 2006.

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