APA (7th ed.) Citation

Twain, M. (2005). The Mysterious Stranger. Project Gutenberg.

Chicago Style (17th ed.) Citation

Twain, Mark. The Mysterious Stranger. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Twain, Mark. The Mysterious Stranger. Project Gutenberg, 2005.

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