Dyfyniad APA

Lean,Geoffrey. (1978). Rich world, poor world. George Allen & Unwin.

Dyfyniad Arddull Chicago

Lean,Geoffrey. Rich World, Poor World. London: George Allen & Unwin, 1978.

Dyfyniad MLA

Lean,Geoffrey. Rich World, Poor World. George Allen & Unwin, 1978.

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