Worldwatch Institute & Brown, L. R. (1988). State of the world 2001: A Worldwatch Institute report on progress toward a sustainable society. Earthscan.
Citazione stile Chigago Style (17a edizione)Worldwatch Institute e Lester Russell Brown. State of the World 2001: A Worldwatch Institute Report on Progress Toward a Sustainable Society. London: Earthscan, 1988.
Citatione MLA (9a ed.)Worldwatch Institute e Lester Russell Brown. State of the World 2001: A Worldwatch Institute Report on Progress Toward a Sustainable Society. Earthscan, 1988.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.