Dyfyniad APA

Stephen Marshak. (2019). Earth: Portrait of a Planet (Sixth.). W.W. Norton.

Dyfyniad Arddull Chicago

Stephen Marshak. Earth: Portrait of a Planet. Sixth. NewYork: W.W. Norton, 2019.

Dyfyniad MLA

Stephen Marshak. Earth: Portrait of a Planet. Sixth. W.W. Norton, 2019.

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