APA (7th ed.) Citation

Paull, G. A. (2010). Ruby at School. Project Gutenberg.

Chicago Style (17th ed.) Citation

Paull, George A. Ruby at School. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Paull, George A. Ruby at School. Project Gutenberg, 2010.

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