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* {{cite book | last = Bennett | first = Tom | title = The Pro Style: The Complete Guide to Understanding National Football League Strategy | publisher=National Football League Properties, Inc., Creative Services Division | location = Los Angeles | year = 1976}}
* {{cite web|url=http://refereenation.docs.s3.amazonaws.com/2011_NFHS_Football_Rules.pdf|title=2011 NFHS Football Rules Book|year=2011|publisher=Gardener, Robert B.. [[National Federation of State High School Associations|NFHS Publications]]|editor=Colgate, Bob|url-status=dead|archiveurl=https://web.archive.org/web/20160304084406/http://refereenation.docs.s3.amazonaws.com/2011_NFHS_Football_Rules.pdf|archivedate=4. 3. 2016}}
* {{cite book|title=Sports Capitalism: The Foreign Business of American Professional Leagues|url=https://archive.org/details/sportscapitalism0000jozs|first=Frank P.|last=Jozsa| publisher=[[Ashgate Publishing]]|year=2004| isbn=978-0-7546-4185-8}}
* {{cite book|last=Nelson|first=David M.|authorlink=David M. Nelson|title=The Anatomy of a Game: Football, the Rules, and the Men Who Made the Game|publisher=[[University of Delaware Press]]|date=12. 12. 1993|edition=1|page=15|isbn=978-0-87413-455-1|url=https://books.google.com/?id=OmwfnipKuogC&printsec=frontcover#v=onepage}}
* {{cite web|url=http://static.nfl.com/static/content/public/image/rulebook/pdfs/2012%20-%20Rule%20Book.pdf|title=Official Playing Rules and Casebook of the National Football League|year=2012|publisher=[[National Football League]]}}