Worldwatch Institute & Brown, L. R. (1998). State of the world 1998: A Worldwatch Institute report on progress toward a sustainable society. Earthscan ; Norton & company.
Citazione stile Chigago Style (17a edizione)Worldwatch Institute e Lester Russell Brown. State of the World 1998: A Worldwatch Institute Report on Progress Toward a Sustainable Society. London: Earthscan ; Norton & company, 1998.
Citatione MLA (8a ed.)Worldwatch Institute e Lester Russell Brown. State of the World 1998: A Worldwatch Institute Report on Progress Toward a Sustainable Society. Earthscan ; Norton & company, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.