Morgan, I M (November 1948). "Immunization of monkeys with formalin-inactivated poliomyelitis viruses". American Journal of Hygiene. 48 (3): 394–406. doi:10.1093/oxfordjournals.aje.a119251. PMID18893238.
Morgan, I M (November 1948). "Immunization of monkeys with formalin-inactivated poliomyelitis viruses". American Journal of Hygiene. 48 (3): 394–406. doi:10.1093/oxfordjournals.aje.a119251. PMID18893238.