↑ NFL News (3 de enero de 2008). «NFL sets regular-season paid attendance record». ↑ La Monica, camiseta los angeles Paul R. (2007). «Super prices for Super Bowl ads». ↑ NFL News (4 de enero de 2007). «NFL sets paid attendance record». ↑ National Football League, «NFL:America’s Choice,» January 2007, «Copia archivada». ↑ «Harris Interactive | The Harris Poll – Professional Football Still America’s Favorite Sport».
