APA (7th ed.) Citation

Shea, R. (2009). The Helpful Robots. Project Gutenberg.

Chicago Style (17th ed.) Citation

Shea, Robert. The Helpful Robots. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Shea, Robert. The Helpful Robots. Project Gutenberg, 2009.

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