Não informado. (1987). Safety and health at work. International Occupational Safety and Health Information Centre.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Safety and Health at Work. Geneva, Suíça: International Occupational Safety and Health Information Centre, 1987.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Safety and Health at Work. International Occupational Safety and Health Information Centre, 1987.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.