Dyfyniad APA

Bulletin of American museum of natural history, Vol.125(3)1963.

Dyfyniad Arddull Chicago

Bulletin of American Museum of Natural History, Vol.125(3)1963.

Dyfyniad MLA

Bulletin of American Museum of Natural History, Vol.125(3)1963.

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