National Safety Council. (1956). Supervisors safety manual; better production without injury and waste from accidents. s.n.
芝加哥风格引文National Safety Council. Supervisors Safety Manual; Better Production Without Injury and Waste from Accidents. Chicago: s.n, 1956.
MLA引文National Safety Council. Supervisors Safety Manual; Better Production Without Injury and Waste from Accidents. s.n, 1956.
警告：这些引文格式不一定是100％准确.