aWorldwatch Institute, Worldwatch environmental alert series, & Brown, L. R. (2000). State of the world 2000: A Worldwatch Institute report on progress toward a sustainable society. Earthscan Pubs. Ltd.
Citazione stile Chigago Style (17a edizione)aWorldwatch Institute, Worldwatch environmental alert series, e Lester Russell Brown. State of the World 2000: A Worldwatch Institute Report on Progress Toward a Sustainable Society. London: Earthscan Pubs. Ltd, 2000.
Citatione MLA (9a ed.)aWorldwatch Institute, et al. State of the World 2000: A Worldwatch Institute Report on Progress Toward a Sustainable Society. Earthscan Pubs. Ltd, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.