Não informado. (1928). American Journal of Public Health and the Nation's Health. American Public Health Association.
Citação do estilo Chicago (17ª ed.)Não informado. American Journal of Public Health and the Nation's Health. New York: American Public Health Association, 1928.
Citação MLA (8ª ed.)Não informado. American Journal of Public Health and the Nation's Health. American Public Health Association, 1928.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.