APA (7th ed.) Citation

Le Queux, W. (2012). Number 70, Berlin: A Story of Britain's Peril. Project Gutenberg.

Chicago Style (17th ed.) Citation

Le Queux, William. Number 70, Berlin: A Story of Britain's Peril. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Le Queux, William. Number 70, Berlin: A Story of Britain's Peril. Project Gutenberg, 2012.

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