MLBPA Starts Campaign to Unionize Minor League Baseball Players
MLBPA Seeking to Unionize, Represent Minor League Players - Fastball
Minor League Baseball Players Secure Union Recognition in a Major
Minor leaguers form union, 17 days after organizing began
Players union, MLB reach tentative MiLB CBA deal - Ballpark Digest
Long Overdue, Minor League Baseball Players Finally Have a CBA
MLBPA gets more than 50 percent of minor-league players to sign on
Minor League Baseball players haven't unionized, and here's why
MLB says it is prepared to voluntarily accept minor league union
Major League Baseball Players Association - Wikipedia
MLB and Minor Leaguer Players' Union Agree to First CBA - InsideHook