Karl-Gran Mler, J. R. V. (2005). Valuing Environmental Changes. ELSEVIER.
Lua i Stíl Chicago (17ú heag.)Karl-Gran Mler, Jeffrey R. Vincent. Valuing Environmental Changes. ELSEVIER, 2005.
Lua MLA (8ú heag.)Karl-Gran Mler, Jeffrey R. Vincent. Valuing Environmental Changes. ELSEVIER, 2005.
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