APA (7th ed.) Citation

Le Queux, W. (2008). The Mystery of the Green Ray. Project Gutenberg.

Chicago Style (17th ed.) Citation

Le Queux, William. The Mystery of the Green Ray. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Le Queux, William. The Mystery of the Green Ray. Project Gutenberg, 2008.

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