Não informado. (1944). Industrial health bulletin. Department of National Health and Welfare, Industrial Health Division.
Chicago-referens (17:e uppl.)Não informado. Industrial Health Bulletin. Ottawa: Department of National Health and Welfare, Industrial Health Division, 1944.
MLA-referens (8:e uppl.)Não informado. Industrial Health Bulletin. Department of National Health and Welfare, Industrial Health Division, 1944.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.