Não informado. (1957). Influenza surveillance. Communicable Disease Center.
Style de citation Chicago (17e éd.)Não informado. Influenza Surveillance. Atlanta, Ga: Communicable Disease Center, 1957.
Style de citation MLA (8e éd.)Não informado. Influenza Surveillance. Communicable Disease Center, 1957.
Attention : ces citations peuvent ne pas être correctes à 100%.