APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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