National Safety Council. (1978). Supervisors safety manual: Better production without injury and waste from accidents (5th ed.). National Safety Council.
Chicago-Zitierstil (17. Ausg.)National Safety Council. Supervisors Safety Manual: Better Production Without Injury and Waste from Accidents. 5th ed. Chicago: National Safety Council, 1978.
MLA-Zitierstil (8. Ausg.)National Safety Council. Supervisors Safety Manual: Better Production Without Injury and Waste from Accidents. 5th ed. National Safety Council, 1978.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.