1. NCAA lightning safety guidelines. NCAA; 2001. http://files.leagueathletics.com/Images/Club/14690/NCAALightningGuidelines.pdf.
2. National Weather Service. Lightning fact page. 2012. http://www.lightningsafety.noaa.gov/statistics.html.
3. National Weather Service. Lightning fatalities. 2012. http://www.nws.noaa.gov/om/hazstats.shtml. Accessed 29 Feb 2012.
4. US Department of Commerce, NOAA. “How Dangerous Is Lightning?” National Weather Service, NOAA’s National Weather Service. https://www.weather.gov/safety/lightning-odds. Accessed 12 Mar 2019.
5. Lopez RE, Holle RL, Heitkamp TA, Boyson M, Cherington M, Langford K. The underreporting of lightning injuries and deaths in Colorado. Bull Am Meteorol Soc. 1993;74(11):2171–8.