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Lua i Stíl Chicago (17ú heag.)IUCN--The World Conservation Union, (Nature Conservancy (U.S, agus World Bank. ?How Much Is an Ecosystem Worth: Assessing the Economic Value of Conservation. .Washington, DC: IUCN, the Nature Conservancy, the World Bank, 2005.
Lua MLA (9ú heag.)IUCN--The World Conservation Union, et al. ?How Much Is an Ecosystem Worth: Assessing the Economic Value of Conservation. IUCN, the Nature Conservancy, the World Bank, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.