What's The Difference Between The NFL & USFL?
XFL, USFL should explore potential merger - Houston Business Journal
USFL's debut will put new rules into play
New USFL rules include three-point tries, best-of-three overtime shootout, onside kick alternative
Breaking down differences in USFL rules vs. NFL
USFL rules: 3-point conversions, two forward passes, biggest NFL differences
NBC To Broadcast USFL Games Along With Fox Under Multi-Year Rights Deal – Deadline
How the XFL is Changing the Game of Football
Latest NFL rule change a reminder that kickoffs are in danger: 'To do nothing was unacceptable'
USFL Scorigami as of week 2! : r/USFL
USFL rules, explained: The biggest differences vs. NFL and XFL, including kickoffs and incomplete clock rules