APA (7th ed.) Citation

Curtis, W. E. (2013). Abraham Lincoln. Project Gutenberg.

Chicago Style (17th ed.) Citation

Curtis, William Eleroy. Abraham Lincoln. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Curtis, William Eleroy. Abraham Lincoln. Project Gutenberg, 2013.

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