Não informado. (1949). Occupational Health. Royal College of Nursing Society of Occupational Health Nursing.
Lua i Stíl Chicago (17ú heag.)Não informado. Occupational Health. London: Royal College of Nursing Society of Occupational Health Nursing, 1949.
Lua MLA (8ú heag.)Não informado. Occupational Health. Royal College of Nursing Society of Occupational Health Nursing, 1949.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.