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Ken Griffey Jr. retiring at age 40 - The San Diego Union-Tribune
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MLB: Ken Griffey Jr. retiring at age 40 - Deseret News
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2013 LAD Media Guide, PDF, Major League Baseball
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Ken Griffey Jr. retiring at age 40 - The San Diego Union-Tribune
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Ken Griffey Jr. Retires After 22 Seasons - The New York Times
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August 31, 1990: Ken Griffey Jr. and Sr. get back-to-back hits in father-son debut with Mariners – Society for American Baseball Research
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The Baseball Analysts: November 2003 Archives
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Mariners hit a home run with celebration to retire Ken Griffey Jr.'s number
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Topps – Page 4 – SABR's Baseball Cards Research Committee
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Ken Griffey Jr. - Wikipedia
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⚾️On September 14, 1990 the Seattle Mariners' Ken Griffey and his son, Ken Griffey, Jr., become the first father and son to hit homers in the same major