The NFL has a historical record of every Super Bowl score by quarter on the Super Bowl section of their official website. A list can be found by hovering over the Schedules button on the main menu toolbar, selecting the Super Bowl 50 page, scrolling down and clicking the Super Bowl Records link.
The Super Bowl Records page offers a comprehensive list of stats throughout history by player and by team. Super Bowl scores by quarter can be found by clicking the History button on the menu toolbar at the top of this page. Here, every Super Bowl game is listed with a drop-down menu. Clicking Boxscore in this menu directs visitors to those scores.