Redskins anticipate adding tackle as they bring in Donald Penn - Washington Times
A Month Ago, Donald Penn Was A Free Agent. Now He's The Redskins Starting Left Tackle.
Redskins to pick up 5th-year option on Robert Griffin III – The Morning Call
Donald Penn wants to continue playing and is open to a return with the Redskins - Hogs Haven
Holding the line: Ereck Flowers and Donald Penn play effectively in opener against Philly - The Athletic
Fred Davis could still land multi-year deal with Redskins - NBC Sports
Oakland Raiders Extend Donald Penn: Why It Was Important - Last Word on Pro Football
Raiders' Donald Penn expected to return this week
Donald Penn retires as a Raider
Rapaport: Very clear that Williams situation is 'not going well'
Donald Penn still has the urge to play football, reacts to the Raiders' offseason moves