APA (7th ed.) Citation

Baum, P. F. (2007). The Principles of English Versification. Project Gutenberg.

Chicago Style (17th ed.) Citation

Baum, Paull F. The Principles of English Versification. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Baum, Paull F. The Principles of English Versification. Project Gutenberg, 2007.

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