Dyfyniad APA

S Vere Benson. Observer's book of Birds. Frederick marne and Co.

Dyfyniad Arddull Chicago

S Vere Benson. Observer's Book of Birds. Frederick marne and Co.

Dyfyniad MLA

S Vere Benson. Observer's Book of Birds. Frederick marne and Co.

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