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Lua i Stíl Chicago (17ú heag.)Bergh, Jeroen C. J. M. van den. Ecological Economics and Sustainable Development: Theory, Methods, and Applications. Cheltenham, UK: Edward Elgar, 1996.
Lua MLA (9ú heag.)Bergh, Jeroen C. J. M. van den. Ecological Economics and Sustainable Development: Theory, Methods, and Applications. Edward Elgar, 1996.
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