Barclays NFL Extra Points Card - 20,000 Point Bonus [Direct Link Added] - Doctor Of Credit
Why did the NFL move back the extra point? SiOWfa15: Science in Our World: Certainty and Controversy
NFL rule adjustment to put suspense in extra points – The Denver Post
NFL PAT proposal: A 43-yard extra point kick is a terrible idea. Here's a better alternative.
NFL eliminates extra-point attempt after game-winning touchdown – The Denver Post
NFL votes to move extra points back to 15-yard line
NFL Changing Extra Point Rule for 2015
Dallas Cowboys Kicker Misses Record Four Extra Points –
In the NFL, is the extra point truly a good thing?