found: EFL handbook, 2016/17:t.p. (EFL) p.1 (EFL is the brand name of The Football League Limited) p.11 (EFL, English Football League, is the largest single body of professional clubs in European Football; it is responsible for administering and regulating the EFL, EFL Cup and EFL Trophy; formed in 1888, the EFL is the world's original league football competition)
found: Its website, viewed 22 Mar. 2017:home p. (EFL) news p. (news item posted 12 Nov. 2015: The Football League is to be re-named the English Football League as part of a comprehensive corporate and competition re-branding; the new title, which will come into use at the conclusion of the 2015/16 season and ahead of the 2016/17 campaign, will be shortened to EFL for everyday use across the game) contact p. (EFL Operations Centre, EFL House, 10-12 West Cliff, Preston PR1 8HU; EFL Commercial Office, 55 Blandford Street, London W1U 7HW)
found: Wikipedia, viewed 23 Mar. 2017:under English Football League (English Football League; EFL; a league competition featuring professional football clubs from England and Wales)