Não informado. (1915). Accident prevention magazine. Portland Cement Association.
Chicagoスタイル(17版)引用形式Não informado. Accident Prevention Magazine. Chicago, Ill: Portland Cement Association, 1915.
MLA(8版)引用形式Não informado. Accident Prevention Magazine. Portland Cement Association, 1915.
警告: この引用は必ずしも正確ではありません.