Proceedings of the American Thoracic Society. Cambridge University Press.
Dyfyniad Arddull ChicagoProceedings of the American Thoracic Society. Cambridge University Press.
Dyfyniad MLAProceedings of the American Thoracic Society. Cambridge University Press.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.