Não informado. (1949). Occupational Health. Royal College of Nursing Society of Occupational Health Nursing.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Occupational Health. London: Royal College of Nursing Society of Occupational Health Nursing, 1949.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Occupational Health. Royal College of Nursing Society of Occupational Health Nursing, 1949.
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