Não informado. (1973). Job safety and health. Occupational Safety and Health Administration.
Chicago-referens (17:e uppl.)Não informado. Job Safety and Health. Washington: Occupational Safety and Health Administration, 1973.
MLA-referens (8:e uppl.)Não informado. Job Safety and Health. Occupational Safety and Health Administration, 1973.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.