MLB Players React to the Pitch Clock and Baseballs' New Rules - The New York Times
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Examining Perceptions of Baseball's Eras: A Statistical Comparison – The Sport Journal
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Baseball Dead Ball Rules
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Dead-ball era - Wikipedia
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The Rise and Fall of the Deadball Era – Society for American Baseball Research
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The New Dead Ball Era | Pitcher List
Live Ball Era | A Baseball Term at Sports Pundit
Baseball changes by MLB harken back to dead-ball era - Sports Illustrated
What Does ERA Mean in Baseball? - SportsRec
What do the 'dead ball' and 'live ball' eras refer to in the history of Major League Baseball? - Quora
The first home runs of the Live Ball Era
What Does ERA Mean in Baseball? - SportsRec
