Speed Goals: Decoding the 40-Yard Dash
Some Clarification is in Order: Average Speed by Position - Mile High Report
How are football (NFL) players 220+ pounds but run like a track athlete? How do you get that speed with that size? - Quora
2020 NFL Combine: Most important drills for each position, including target times and distances
Top 10 fastest 40-yard dash in NFL: Who holds the all-time record?
Metrics that Matter: Learning from weight-adjusted 40 times, Fantasy Football News, Rankings and Projections
Drafting a Wide Receiver: Are 40 times and other combine measurables relevant? - Cincy Jungle
NFL Combine drills, explained: What the 40-yard dash, bench press, other drills tell us about draft prospects
Comparing NFL and high school 40-yard dash times: A horrifying revelation
Speed Across NFL Positions – The Harvard Sports Analysis Collective
2023 NFL Scouting Combine: Calijah Kancey posts fastest 40-yard dash time by DT since 2003
NFL draft analysts should be leery of unofficial times in 40-yard dash – The Denver Post