Cleghorn E. New York, NY: Dutton; 2021. ISBN: 9780593182956.
Washington, DC: Department of Veterans Affairs, Office of Inspector General. January 5, 2021. Report No. 20-01521-48.
de Bienassis K, Llena-Nozal A, Klazinga N for the Organisation for Economic Co-operation and Development. Paris, France: OECD Publishing; 2020. OECD Health Working Papers, No. 121.
Washington, DC: Department of Veterans Affairs, Office of Inspector General; September 3, 2020. Report No 19-09493-249.
Sydney, Australia: Australian Commission on Safety and Quality in Health Care; 2008. ISBN: 9780980346275.