Historical clue formulations

• Skipper whose #6 was retired in 2014 — 2016-05-14
• Co-author of "The Yankee Years" — 2015-12-05
• "The Yankee Years" co-author — 2015-08-07
• Manager with four World Series titles — 2012-07-08
• Author of "Chasing the Dream: My Lifelong Journey to the World Series" — 2010-12-10