Não informado. (1953). Occupational health review. Department of National Health and Welfare.
Chicago-referens (17:e uppl.)Não informado. Occupational Health Review. Ottawa: Department of National Health and Welfare, 1953.
MLA-referens (8:e uppl.)Não informado. Occupational Health Review. Department of National Health and Welfare, 1953.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.