(2005). How much is an ecosystem worth?: Assessing the economic value of conservation. WB.
استشهاد بنمط شيكاغوHow Much Is an Ecosystem Worth?: Assessing the Economic Value of Conservation. WB, 2005.
MLA استشهادHow Much Is an Ecosystem Worth?: Assessing the Economic Value of Conservation. WB, 2005.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.