APA (7e ed.) Bronvermelding

National Safety Council. (1956). Supervisors safety manual; better production without injury and waste from accidents. s.n.

Chicago (17e ed.) Bronvermelding

National Safety Council. Supervisors Safety Manual; Better Production Without Injury and Waste from Accidents. Chicago: s.n, 1956.

MLA (9e ed.) Bronvermelding

National Safety Council. Supervisors Safety Manual; Better Production Without Injury and Waste from Accidents. s.n, 1956.