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Lua i Stíl Chicago (17ú heag.)Eichhorn, W. Economic Theory of Natural Resources. Wurzburg: Physica-Verlag, 1982.
Lua MLA (9ú heag.)Eichhorn, W. Economic Theory of Natural Resources. Physica-Verlag, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.