Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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