1. California State Public Health Officer Order of July 26, 2021; New York City Order of the Commissioner of Health & Mental Hygiene to Require Covid-19 Vaccination in the Workplace; December 13, 2021; California State Public Health Officer Order of February 22, 2022.
2. State of Immunity: The Politics of Vaccination in Twentieth-Century America;Colgrove,2006
3. Compulsory Vaccination
4. Blue v Beach, 56 N.E. 89, 91 (Ind. 1900).