APA (7th ed.) Citation

Baum, P. F. (1922). The principles of English versification. Harvard university press; [etc., etc.].

Chicago Style (17th ed.) Citation

Baum, Paull Franklin. The Principles of English Versification. Cambridge: Harvard university press; [etc., etc.], 1922.

MLA (9th ed.) Citation

Baum, Paull Franklin. The Principles of English Versification. Harvard university press; [etc., etc.], 1922.