Não informado. (1953). Occupational health bulletin. Department of National Health and Welfare, Industrial Health Division.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Occupational Health Bulletin. Ottawa: Department of National Health and Welfare, Industrial Health Division, 1953.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Occupational Health Bulletin. Department of National Health and Welfare, Industrial Health Division, 1953.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.