APA (7th ed.) Citation

Roget, P. M. (2004). Roget's Thesaurus of English Words and Phrases. Project Gutenberg.

Chicago Style (17th ed.) Citation

Roget, Peter Mark. Roget's Thesaurus of English Words and Phrases. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Roget, Peter Mark. Roget's Thesaurus of English Words and Phrases. Project Gutenberg, 2004.

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