World Book. World Book.
Dyfyniad Arddull ChicagoWorld Book. World Book.
Dyfyniad MLAWorld Book. World Book.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
Dyfyniad APA
World Book. World Book.
Dyfyniad Arddull ChicagoWorld Book. World Book.
Dyfyniad MLAWorld Book. World Book.