Não informado. (1949). Occupational Health. Royal College of Nursing Society of Occupational Health Nursing.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Occupational Health. London: Royal College of Nursing Society of Occupational Health Nursing, 1949.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Occupational Health. Royal College of Nursing Society of Occupational Health Nursing, 1949.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.