APA (7th ed.) Citation

Beard, M. R., & Beard, C. A. (2007). History of the United States, Volume 1. Project Gutenberg.

Chicago Style (17th ed.) Citation

Beard, Mary Ritter, and Charles A. Beard. History of the United States, Volume 1. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Beard, Mary Ritter, and Charles A. Beard. History of the United States, Volume 1. Project Gutenberg, 2007.

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