Não informado. (1953). Occupational health bulletin. Department of National Health and Welfare, Industrial Health Division.
Chicago-Zitierstil (17. Ausg.)Não informado. Occupational Health Bulletin. Ottawa: Department of National Health and Welfare, Industrial Health Division, 1953.
MLA-Zitierstil (8. Ausg.)Não informado. Occupational Health Bulletin. Department of National Health and Welfare, Industrial Health Division, 1953.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.