June 7, 1956: Willie Mays homers twice in Giants' exhibition win at Metropolitan Stadium – Society for American Baseball Research
When Willie Mays made a surprise appearance in a sportswriters' game
Willie Mays love-fest at dedication of new Atherton Little League field, News, Almanac Online
Remembering the Polo Grounds - Ballpark Digest
Willie Mays: Where are they now? - Sports Illustrated
Baseball's sweetest song: Willie Mays, forever young, is 90
September 29, 1957: End of an era as Giants play final home game in New York – Society for American Baseball Research
Willie Mays - The Life, The Legend
Willie Mays: Where are they now? - Sports Illustrated
The 'other Willie' and the early San Francisco Giants
The Giants Say Good-Bye to the Polo Grounds
Honoring Willie Mays is honoring Mets history—regardless of his time in Queens - Amazin' Avenue