APA (7th ed.) Citation

Beach, C. A., & Herbert, R. G. (2010). Air Service Boys Over the Enemy's Lines; Or, The German Spy's Secret. Project Gutenberg.

Chicago Style (17th ed.) Citation

Beach, Charles Amory, and Robert Gaston Herbert. Air Service Boys Over the Enemy's Lines; Or, The German Spy's Secret. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Beach, Charles Amory, and Robert Gaston Herbert. Air Service Boys Over the Enemy's Lines; Or, The German Spy's Secret. Project Gutenberg, 2010.

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