APA (7th ed.) Citation

Longford, F. P. (1975). Abraham Lincoln. Putnam.

Chicago Style (17th ed.) Citation

Longford, Frank Pakenham. Abraham Lincoln. New York: Putnam, 1975.

MLA (9th ed.) Citation

Longford, Frank Pakenham. Abraham Lincoln. Putnam, 1975.

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