Camrbell. (1964). The oxford book of birds (4th ed.). Oxford University Press.
Dyfyniad Arddull ChicagoCamrbell. The Oxford Book of Birds. 4th ed. Oxford University Press, 1964.
Dyfyniad MLACamrbell. The Oxford Book of Birds. 4th ed. Oxford University Press, 1964.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.