Al Horford extension is Brad Stevens' latest step in securing Celtics' roster – NBC Sports Boston
Al Horford Career Earnings: How much money has Boston Celtics' player made in the NBA?
How Al Horford's Absence Proved His Value To The Boston Celtics
Marcus Smart, Al Horford (health & safety) will both miss Game 1 vs. Heat
NBA Notebook: Habits carried Al Horford back to the Celtics and the playoffs
Al Horford sounds off on his early $20 million Celtics extension
Al Horford has huge incentive in contract if Celtics win NBA Finals
Al Horford was the unsung hero of the Celtics' Game 1 victory
After first year, Al Horford embraces high expectations and pressure in Boston – Boston Herald
Horford, Tatum help Celtics even series with 116-198 victory
Al Horford makes first NBA Finals, earns contract incentive 2 years after Sixers trade – NBC Sports Philadelphia
The Celtics' closing opportunity - Why the stakes are higher than ever - ESPN
In Philly Or Boston, Anna Horford Has Brother Al's Back
Al Horford's 12 million reasons to carry Celtics to NBA title
Al Horford, Celtics agree to 2-year contract to keep him in Boston