Dellin Betances - Wikipedia
MLB -- Yankees bolster AL's best bullpen, beat out rivals in deal for Zach Britton - ESPN
Former Yankees All-Star reliever Dellin Betances helped change baseball - Pinstripe Alley
Why the Yankees needed David Robertson, by Gus Weinstein, Trio Sports
Aaron Boone gave the Yankees an identity: 'Savages in that box' - The Washington Post
Coles: Looking at Aroldis Chapman's Choice to Remain a Yankee - Pinstriped Prospects
Dellin Betances - Wikipedia
Inside the Yankees' championship belt ritual: With each win they notch, it brings teammates closer
Dellin Betances Reportedly Retires - MLB Trade Rumors