For Philadelphia's Sons of Ben, love of MLS started with DC United

Sons of Ben rejoice in Philly expansion

An oral history: On their 10 year anniversary, the Sons of Ben are trying to rediscover a lost identity

DC United's Benteke, Miller selected to MLS All-Star roster that will face Arsenal - WTOP News

Sons of Ben (MLS supporters association) - Wikipedia

As D.C. United looks to its own stadium, Philadelphia's team provides a template - The Washington Post

The Philadelphia Union's Sons of Ben prove brotherhood transcends the field

Kickin' it with the Sons of Ben - Philadelphia Weekly

Philadelphia Union have a shot at redemption in MLS Cup final rematch - AS USA