John Sullivan's Rams career ended prematurely but sparked an 80-pound weight loss - The Athletic
Former Vikings center John Sullivan ready for bigger role in Act II
Old man' Joe Berger remains a key figure on Vikings offensive line
Minnesota Vikings 2015 Team Preview and Prediction
Rams sign center John Sullivan to secure offensive line – Daily News
Joe Berger: Was he really a top-50 player last year?
Minnesota Vikings Release Longtime Center John Sullivan
Warner, Cardinals dominate Favre, Vikings 30-17 - The San Diego Union-Tribune
Minnesota Vikings: Five Best and Worst Drafts from the Past Decade, News, Scores, Highlights, Stats, and Rumors