Winter Ball: A History of Baseball, Cuba, and Race
100 years ago black baseball players got a league of their own - The Washington Post
Baseball's Race Problem
1951: The Year Baseball Really Integrated
Jackie Robinson - Bill of Rights Institute
The Secret History Of Black Baseball Players In Japan : Code Switch : NPR
IWU baseball saw few Black players, integration issues for decades
MLB hopes the push for more Black players will soon be reflected on rosters
Black players in organized white baseball in the pre-integration era - Beyond the Box Score