താപനം. Academy of Climate Change Education and Research.
Dyfyniad Arddull Chicagoതാപനം. Thrissur: Academy of Climate Change Education and Research.
Dyfyniad MLAതാപനം. Academy of Climate Change Education and Research.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.