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WikiPedia: David_Crane_(nhà_sản_xuất) http://cantic.bnc.cat/registres/CUCId/a10791280 http://www.buddytv.com/articles/the-class/exclusiv... http://www.jweekly.com/article/full/59890/its-been... http://thefutoncritic.com/news/2010/09/22/biggest-... http://www.tv.com/david-crane/person/3943/biograph... http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?... http://data.bibliotheken.nl/id/thes/p314416455 http://www.bbc.co.uk/pressoffice/pressreleases/sto... https://www.imdb.com/name/nm0186331/ https://aleph.nkp.cz/F/?func=find-c&local_base=aut...