Não informado. (1917). NATIONAL SAFETY NEWS. National Safety Council.
Cita Chicago Style (17a ed.)Não informado. NATIONAL SAFETY NEWS. Chicago, Ill: National Safety Council, 1917.
Cita MLA (8a ed.)Não informado. NATIONAL SAFETY NEWS. National Safety Council, 1917.
Precaución: Estas citas no son 100% exactas.