Adrian Beltre 'completely happy' with retirement after 21 MLB

Adrian Beltre Just Keeps Getting Better With Age - WSJ

Adrian Beltre announces retirement

Carlos Beltran Announces Retirement - MLB Trade Rumors

Adrian Beltre, 21-year MLB veteran, announces retirement

Texas Rangers: Nowitzki understands Beltre's tough decision

After years of lacking leadership, Rangers will try leadership by committee to solve their problem

Texas Rangers Third Baseman Adrian Beltre Announces Retirement After 21 Seasons In MLB

Adrián Beltré – Society for American Baseball Research

Rangers' Adrian Beltre retires after 21 seasons

Intense and eccentric, no one had more fun than Adrian Beltre - ESPN