Analysis of information sources in references of the Wikipedia article "1931 Indianapolis 500" in English language version.
Many Spills Mark Event. Arnold, 1930 Champion, Crashes at 400 Miles When Leading by About 7 Miles. Frame Gets Second Place. Hepburn, Meyer and Snowberger Next Across. Drizzle Adds to the Drivers' Perlis. Arnold's Car Catches Fire. Averages 96,629 Miles an Hour. Arnold Sets New Mark. Schneider's Patience Rewarded. Drivers Resume Breakneck Speed. Fate catapulted Louie Schneider, onetime Indianapolis motorcycle policeman, into a winner in a stunning upset at the 500-mile automobile race over the Indianapolis Motor Speedway today.