APA (7th ed.) Citation

Hope, A. (2003). The Secret of the Tower. Project Gutenberg.

Chicago Style (17th ed.) Citation

Hope, Anthony. The Secret of the Tower. Project Gutenberg, 2003.

MLA (9th ed.) Citation

Hope, Anthony. The Secret of the Tower. Project Gutenberg, 2003.

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