National Safety Council. (1956). Supervisors safety manual; better production without injury and waste from accidents. s.n.
Chicagoスタイル(17版)引用形式National Safety Council. Supervisors Safety Manual; Better Production Without Injury and Waste from Accidents. Chicago: s.n, 1956.
MLA(9版)引用形式National Safety Council. Supervisors Safety Manual; Better Production Without Injury and Waste from Accidents. s.n, 1956.
警告: この引用は必ずしも正確ではありません.