APA (7th ed.) Citation

Audubon, M. R., & Coues, E. (2012). Audubon and his Journals, Volume I (of 2). Project Gutenberg.

Chicago Style (17th ed.) Citation

Audubon, Maria R., and Elliott Coues. Audubon and His Journals, Volume I (of 2). Project Gutenberg, 2012.

MLA (9th ed.) Citation

Audubon, Maria R., and Elliott Coues. Audubon and His Journals, Volume I (of 2). Project Gutenberg, 2012.

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