APA-viite (7. p.)
ebrary, Inc. (2005). How much is an ecosystem worth?: Assessing the economic value of conservation. IUCN, the Nature Conservancy, the World Bank.
Chicago-viite (17. p.)
ebrary, Inc. How Much Is an Ecosystem Worth?: Assessing the Economic Value of Conservation. Washington, DC: IUCN, the Nature Conservancy, the World Bank, 2005.
MLA-viite (9. p.)
ebrary, Inc. How Much Is an Ecosystem Worth?: Assessing the Economic Value of Conservation. IUCN, the Nature Conservancy, the World Bank, 2005.
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