Não informado. (1962). Cis information sheet. International Occupational Safety and Health Information Centre.
Chicago-referens (17:e uppl.)Não informado. Cis Information Sheet. Geneva, Suíça: International Occupational Safety and Health Information Centre, 1962.
MLA-referens (8:e uppl.)Não informado. Cis Information Sheet. International Occupational Safety and Health Information Centre, 1962.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.