APA (7th ed.) Citation

Henry, O. (2001). Sixes and Sevens. Project Gutenberg.

Chicago Style (17th ed.) Citation

Henry, O. Sixes and Sevens. Project Gutenberg, 2001.

MLA (9th ed.) Citation

Henry, O. Sixes and Sevens. Project Gutenberg, 2001.

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