APA (7th ed.) Citation

Le Queux, W. (2010). Spies of the Kaiser: Plotting the Downfall of England. Project Gutenberg.

Chicago Style (17th ed.) Citation

Le Queux, William. Spies of the Kaiser: Plotting the Downfall of England. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Le Queux, William. Spies of the Kaiser: Plotting the Downfall of England. Project Gutenberg, 2010.

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