APA (7th ed.) Citation

Old Humphrey & Summers, T. O. (2008). History, Manners, and Customs of the North American Indians. Project Gutenberg.

Chicago Style (17th ed.) Citation

Old Humphrey and Thomas O. Summers. History, Manners, and Customs of the North American Indians. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Old Humphrey and Thomas O. Summers. History, Manners, and Customs of the North American Indians. Project Gutenberg, 2008.

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