George Steinbrenner Cameo on Seinfeld
When 'Seinfeld' Abandoned The Mets For The Yankees
George Steinbrenner - Seinfeld, George Costanza
Buck Showalter says Seinfeld cameo costs him money (video)
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Quantifying the Boss's 'Seinfeld' Legacy - WSJ
Hot Stove #112 – The Two Yankee Georges (Costanza and Steinbrenner) and Lonnie's Jukebox (The Organ Chronicles)
Seinfeld Actors Who Played More Than One Role On The Series
