United States. Government Accountability Office. Hospital Emergency Departments: Bibliography (GAO-09-348SP, April 30, 2009), an E-supplement to GAO-09-347, text, April 30, 2009; (https://digital.library.unt.edu/ark:/67531/metadc290878/m1/1/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .