National Safety Council. (1956). Supervisors safety manual; better production without injury and waste from accidents. s.n.
Цитирование в стиле Чикаго (17-е изд.)National Safety Council. Supervisors Safety Manual; Better Production Without Injury and Waste from Accidents. Chicago: s.n, 1956.
Цитирование MLA (9-е изд.)National Safety Council. Supervisors Safety Manual; Better Production Without Injury and Waste from Accidents. s.n, 1956.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.