APA (7th ed.) Citation

Sutherland, G. (2010). Twentieth Century Inventions: A Forecast. Project Gutenberg.

Chicago Style (17th ed.) Citation

Sutherland, George. Twentieth Century Inventions: A Forecast. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Sutherland, George. Twentieth Century Inventions: A Forecast. Project Gutenberg, 2010.

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