Dyfyniad APA

Parks | International Union for Conservation of Nature (IUCN). Cambridge University Press.

Dyfyniad Arddull Chicago

Parks | International Union for Conservation of Nature (IUCN). Cambridge University Press.

Dyfyniad MLA

Parks | International Union for Conservation of Nature (IUCN). Cambridge University Press.

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