Pergament, Alan (1. februar 2013). «CBS' play of Lewis, Harbaugh angles to be judged»(engelsk). Arkivert fra originalen 5. februar 2013. Besøkt 24. juli 2020. «What's the over-under on how many times the coaching brothers, Jim (49er) and John Harbaugh (Ravens) will be shown on the sidelines? (A lot, after all this game is being called the Superbro or Harbowl in some quarters. I predict 50).»
superbowl-2013.org
«Super Bowl 2013». Superbowl-2013.org(engelsk). Arkivert fra originalen 31. desember 2012. Besøkt 23. juli 2020.
Pergament, Alan (1. februar 2013). «CBS' play of Lewis, Harbaugh angles to be judged»(engelsk). Arkivert fra originalen 5. februar 2013. Besøkt 24. juli 2020. «What's the over-under on how many times the coaching brothers, Jim (49er) and John Harbaugh (Ravens) will be shown on the sidelines? (A lot, after all this game is being called the Superbro or Harbowl in some quarters. I predict 50).»