Lloyd (1982), p. xix. Roget, Peter Mark (1982), Lloyd, Sue (ed.), Roget's Thesaurus of English Words and Phrases, Harlow, Essex: Longman, ISBN0-582-55635-X, OCLC8546324
Lloyd (1982), p. xiii, quote: "The name has become synonymous with the Thesaurus, yet Dr Roget himself is a shadowy figure." Roget, Peter Mark (1982), Lloyd, Sue (ed.), Roget's Thesaurus of English Words and Phrases, Harlow, Essex: Longman, ISBN0-582-55635-X, OCLC8546324