Texas. Department of State Health Services. Texas EMS Magazine, Volume 31, Number 6, November/December 2010, periodical, December 2010; (https://texashistory.unt.edu/ark:/67531/metapth1507909/m1/2/: accessed May 25, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .

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