APA (7th ed.) Citation

Le Queux, W. (2012). The Mysterious Three. Project Gutenberg.

Chicago Style (17th ed.) Citation

Le Queux, William. The Mysterious Three. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Le Queux, William. The Mysterious Three. Project Gutenberg, 2012.

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