Não informado. (1972). Abortion Surveillance. Center for Disease Control.
Style de citation Chicago (17e éd.)Não informado. Abortion Surveillance. Atlanta, Ga: Center for Disease Control, 1972.
Style de citation MLA (8e éd.)Não informado. Abortion Surveillance. Center for Disease Control, 1972.
Attention : ces citations peuvent ne pas être correctes à 100%.