Dyfyniad APA

International Journal of COPD | Dove Medical Press. Cambridge University Press.

Dyfyniad Arddull Chicago

International Journal of COPD | Dove Medical Press. Cambridge University Press.

Dyfyniad MLA

International Journal of COPD | Dove Medical Press. Cambridge University Press.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.