Não informado. (1918). Commonwealth. Department of Public Health.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Commonwealth. Boston, Mass: Department of Public Health, 1918.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Commonwealth. Department of Public Health, 1918.
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