2013. Treadwell 2001: str. 21–22 „The Black Gang”. BritishLibrary catalogue. London: BritishLibrary. Arhivirano iz originala na datum 2022-08-16. Pristupljeno
Gutenberg Mr Punch at the BritishLibrary Arhivirano 2006-03-02 na Wayback Machine-u, an article from the BritishLibrary website John Leech Sketch archives
"mega-biblioteka" na svijetu (ispred BritishLibrary, Kongresne biblioteke, francuske Bibliothèque Nationale, a ispred New York Public Library). Harvard također ima