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Lua i Stíl Chicago (17ú heag.)BROWN, Lester R. [et al]. State of the World 1991: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York: W.W. Norton and Co, 1991.
Lua MLA (9ú heag.)BROWN, Lester R. [et al]. State of the World 1991: A Worldwatch Institute Report on Progress Toward a Sustainable Society. W.W. Norton and Co, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.