Não informado. (1917). NATIONAL SAFETY NEWS. National Safety Council.
Chicagoスタイル(17版)引用形式Não informado. NATIONAL SAFETY NEWS. Chicago, Ill: National Safety Council, 1917.
MLA(8版)引用形式Não informado. NATIONAL SAFETY NEWS. National Safety Council, 1917.
警告: この引用は必ずしも正確ではありません.