Não informado. (1949). Occupational Health. Royal College of Nursing Society of Occupational Health Nursing.
Chicago-referens (17:e uppl.)Não informado. Occupational Health. London: Royal College of Nursing Society of Occupational Health Nursing, 1949.
MLA-referens (8:e uppl.)Não informado. Occupational Health. Royal College of Nursing Society of Occupational Health Nursing, 1949.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.