APA (7th ed.) Citation

Ketcham, H. (2004). The Life of Abraham Lincoln. Project Gutenberg.

Chicago Style (17th ed.) Citation

Ketcham, Henry. The Life of Abraham Lincoln. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Ketcham, Henry. The Life of Abraham Lincoln. Project Gutenberg, 2004.

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