== Kilder / eksterne henvisninger ==
* [http://www.ethanlewis.org/pl/ch1.html Ethan Lewis, "A Structure To Last Forever: The Players' League And The Brotherhood War of 1890"] {{en sprog}}
* [http://www.baseball-almanac.com/yearly/yr1890p.shtml Baseball Almanac – Year In Review : 1890 Players League] {{en sprog}}
* [http://www.retrosheet.org/boxesetc/1891/Y_1891.htm Retrosheet – The 1891 Season] {{en sprog}}
* David Pietrusza. ''Major Leagues: The Formation, Sometimes Absorption and Mostly Inevitable Demise of 18 Professional Baseball Organizations, 1871 to Present.'' Jefferson, NC: McFarland & Company, 1991 (hardcover, {{ISBN|0-89950-590-2}}) and 2005 (softcover, {{ISBN|0-7864-2530-X}}).
* Ed Koszarek. ''The Players League: History Clubs, Ballplyers and Statistics''. Jefferson, NC: McFarland, 2006 (softcover, {{ISBN|0-7864-2079-0}}).
Filosofi Historie Sport Kultur Foreninger Organisationer