APA (7th ed.) Citation

Peter Mark Roget & George W. Davidson. (2004). Roget's thesaurus of English words and phrases. Penguin.

Chicago Style (17th ed.) Citation

Peter Mark Roget and George W. Davidson. Roget's Thesaurus of English Words and Phrases. London: Penguin, 2004.

MLA (9th ed.) Citation

Peter Mark Roget and George W. Davidson. Roget's Thesaurus of English Words and Phrases. Penguin, 2004.

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