Watson, Daniel S.; Shields, Brenda J.; Smith, Gary A. (January 2011). "Snow shovel–related injuries and medical emergencies treated in US EDs, 1990 to 2006". The American Journal of Emergency Medicine. 29 (1): 11–17. doi:10.1016/j.ajem.2009.07.003. PMID20825768.
Watson, Daniel S.; Shields, Brenda J.; Smith, Gary A. (January 2011). "Snow shovel–related injuries and medical emergencies treated in US EDs, 1990 to 2006". The American Journal of Emergency Medicine. 29 (1): 11–17. doi:10.1016/j.ajem.2009.07.003. PMID20825768.