Não informado. (1972). Environmental Health Perspectives. National Institute of Environmenatl Health Sciences.
Citação do estilo Chicago (17ª ed.)Não informado. Environmental Health Perspectives. Research Triangle Park, NC: National Institute of Environmenatl Health Sciences, 1972.
Citação MLA (8ª ed.)Não informado. Environmental Health Perspectives. National Institute of Environmenatl Health Sciences, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.