APA (7th ed.) Citation

Twain, M. (2004). Adventures of Huckleberry Finn, Chapters 21 to 25. Project Gutenberg.

Chicago Style (17th ed.) Citation

Twain, Mark. Adventures of Huckleberry Finn, Chapters 21 to 25. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Twain, Mark. Adventures of Huckleberry Finn, Chapters 21 to 25. Project Gutenberg, 2004.

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