APA (7th ed.) Citation

Le Queux, W. (2009). The Sign of Silence. Project Gutenberg.

Chicago Style (17th ed.) Citation

Le Queux, William. The Sign of Silence. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Le Queux, William. The Sign of Silence. Project Gutenberg, 2009.

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