Não informado. (1924). Industrial hygiene bulletin. Department of Labor, Division of Industrial Hygiene.
Chicago-referens (17:e uppl.)Não informado. Industrial Hygiene Bulletin. New York: Department of Labor, Division of Industrial Hygiene, 1924.
MLA-referens (8:e uppl.)Não informado. Industrial Hygiene Bulletin. Department of Labor, Division of Industrial Hygiene, 1924.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.