Não informado. (1949). Occupational Health. Royal College of Nursing Society of Occupational Health Nursing.
Citação do estilo Chicago (17ª ed.)Não informado. Occupational Health. London: Royal College of Nursing Society of Occupational Health Nursing, 1949.
Citação MLA (8ª ed.)Não informado. Occupational Health. Royal College of Nursing Society of Occupational Health Nursing, 1949.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.