Não informado. (1957). Traffic safety. National Safety Council.
Chicagoスタイル(17版)引用形式Não informado. Traffic Safety. Chicago, Ill: National Safety Council, 1957.
MLA(8版)引用形式Não informado. Traffic Safety. National Safety Council, 1957.
警告: この引用は必ずしも正確ではありません.