June 2, 1954: Jackie Robinson ejected in Brooklyn's rain-shortened win – Society for American Baseball Research
Jackie Robinson broke baseball's color barrier 75 years ago
Jackie Robinson made MLB history on this day in 1947 - Sports Illustrated
The Negro Leagues Up Close, A blog about a century of African-American baseball history
TSN Archives: Jackie Robinson makes the Dodgers team (April 16, 1947, issue)
Today in NYC History: Jackie Robinson Debuts for the Brooklyn Dodgers (1947)
David Sanderson – Winnipeg Free Press
Jackie Robinson breaks baseball barrier: Today in history
TSN Archives: A point-counterpoint on Jackie Robinson's MLB future (Jan. 8, 1947, issue)