Dyfyniad APA

Auk (American Ornithologists Union). American Ornithologists' Union.

Dyfyniad Arddull Chicago

Auk (American Ornithologists Union). American Ornithologists' Union.

Dyfyniad MLA

Auk (American Ornithologists Union). American Ornithologists' Union.

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