Why did Gronk retire? Timeline of NFL retirement, comeback - Sports Illustrated
Report: Here's What Rob Gronkowski Did With His NFL Salary - The Spun: What's Trending In The Sports World Today
Rob Gronkowski announces retirement
Rob Gronkowski retires, won't join Tom Brady for 3rd season
Ex-Patriots tight end Rob Gronkowski announces NFL retirement – NBC Sports Boston
Rob Gronkowski retires, won't join Tom Brady for 3rd season in Tampa Bay
Rob Gronkowski: This is one of the greatest accomplishments in sports history - NBC Sports
4-time champion, All-Pro tight end Rob Gronkowski announces retirement
Bucs Tight End Rob Gronkowski Gives Timeline for Retirement Decision - Bucs Nation
Gronk's legacy: How does he stack up among the best to ever play tight end? - The Boston Globe