Статистика по вакцинации в Калифорнии: R. G. Lin II, California School’s Risks Rise as Vaccinations Drop, Los Angeles Times, March 29, 2009.
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Вспышка кори в США, 2008 г.: Centers for Disease Control and Prevention, Update: Measles – United States, January – July 2008, Morbidity and Mortality Weekly Report 57 (2008): 893–896.