Oakland A's history (7/5): Rickey Henderson hits leadoff homers in
Rickey Henderson - Wikipedia
Henderson hits two home runs in 1989 ALCS Game 4
Blue Jays' George Springer hits 55th career leadoff home run vs. Athletics, moves into second place all-time
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Most career leadoff home runs in MLB history
With Luzardo's big league start: noteworthy starts in A's history
Blue Jays' George Springer hits 55th career leadoff home run vs. Athletics, moves into second place all-time
Oakland A's history (7/5): Rickey Henderson hits leadoff homers in both games of doubleheader - Athletics Nation
Rickey: The Life and Legend of an American Original (Audible Audio Edition): Howard Bryant, JD Jackson, HarperAudio: Books
Amid A's power surge, Rajai Davis shows off speed
George Springer hits 55th career leadoff homer as Blue Jays rout A's 12-1
Nolan Ryan, Rickey Henderson made history on May 1, 1991 - Sports Illustrated
Springer hits 55th career leadoff homer as Blue Jays rout Athletics 12-1
A Chronology of the Best Leadoff Home Run Hitters – Society for American Baseball Research
Laureano 2-run homer highlights 6-run fifth, A's beat ChiSox - The San Diego Union-Tribune
Most career leadoff home runs in MLB history