The NFL's new kickoff rules have made onside kicks impossible
NFL rule changes: Kickoffs aren't dead yet, but they will be
NFL rule changes: Owners to vote on kickoff proposal - Sports
NFL rule changes: Kickoffs, instant replay, fourth-down reviews
NFL kickoff will keep evolving - here's one wild alternative - ESPN
Kill the kickoff? Football may face that one day, but not without
NFL preseason: New helmet, catch, kickoff rules explained
Opinion Football Is Here to Stay - The New York Times
American football rules - Wikipedia
Statistics show a narrow benefit to the NFL's new kickoff rule
NFL kickoffs will be undergoing these major rule changes for 2018
Which XFL rules should the NFL consider stealing? - ESPN
NFL rule change essentially eliminates kickoffs for 2023 season
NFL kickoff rule changes should make the play safer, more exciting