Não informado. (1917). NATIONAL SAFETY NEWS. National Safety Council.
Style de citation Chicago (17e éd.)Não informado. NATIONAL SAFETY NEWS. Chicago, Ill: National Safety Council, 1917.
Style de citation MLA (8e éd.)Não informado. NATIONAL SAFETY NEWS. National Safety Council, 1917.
Attention : ces citations peuvent ne pas être correctes à 100%.