Não informado. (2001). Zoonoses surveillance. Center for Disease Control, Department of Health, Education Welfare.
Chicago-referens (17:e uppl.)Não informado. Zoonoses Surveillance. Atlanta, Ga: Center for Disease Control, Department of Health, Education Welfare, 2001.
MLA-referens (8:e uppl.)Não informado. Zoonoses Surveillance. Center for Disease Control, Department of Health, Education Welfare, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.