APA (7th ed.) Citation

Twain, M. (2009). Extracts from Adam's Diary. Project Gutenberg.

Chicago Style (17th ed.) Citation

Twain, Mark. Extracts from Adam's Diary. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Twain, Mark. Extracts from Adam's Diary. Project Gutenberg, 2009.

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