Worldwatch Institute & Brown, L. R. (1993). State of the world, 1993: A Worldwatch Institute report on progress toward a sustainable society. Norton.
Lua i Stíl Chicago (17ú heag.)Worldwatch Institute agus Lester Russell Brown. State of the World, 1993: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York: Norton, 1993.
Lua MLA (8ú heag.)Worldwatch Institute agus Lester Russell Brown. State of the World, 1993: A Worldwatch Institute Report on Progress Toward a Sustainable Society. Norton, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.