History of American football positions (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "History of American football positions" in English language version.

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books.google.com

Nelson, David (1994). The anatomy of a game: football, the rules, and the men who made the game. University of Delaware Press. p. 476. ISBN 9780874134551.
Bonner, John; Curtis, George William; Alden, Henry Mills; Conant, Samuel Stillman; Foord, John; Schuyler, Montgomery; Davis, Richard Harding; Schurz, Carl; Bangs, John Kendrick; Nelson, Henry Loomis; Harvey, George Brinton Mcclellan; Hapgood, Norman (1915). Harper's Weekly.

Hickie, Gavin (March 12, 2015). "Playing Scrum Half – Coaching Tips". www.rugbytoday.com.