Não informado. (1987). Safety and health at work. International Occupational Safety and Health Information Centre.
Chicago-Zitierstil (17. Ausg.)Não informado. Safety and Health at Work. Geneva, Suíça: International Occupational Safety and Health Information Centre, 1987.
MLA-Zitierstil (8. Ausg.)Não informado. Safety and Health at Work. International Occupational Safety and Health Information Centre, 1987.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.