APA (7th ed.) Citation

Brown, A. F., & Smith, E. B. (2005). The Curious Book of Birds. Project Gutenberg.

Chicago Style (17th ed.) Citation

Brown, Abbie Farwell, and E. Boyd Smith. The Curious Book of Birds. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Brown, Abbie Farwell, and E. Boyd Smith. The Curious Book of Birds. Project Gutenberg, 2005.

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