IUCN--The World Conservation Union, (Nature Conservancy (U.S, & World Bank. (2005). ?How much is an ecosystem worth: Assessing the economic value of conservation. IUCN, the Nature Conservancy, the World Bank.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিIUCN--The World Conservation Union, (Nature Conservancy (U.S, এবং World Bank. ?How Much Is an Ecosystem Worth: Assessing the Economic Value of Conservation. .Washington, DC: IUCN, the Nature Conservancy, the World Bank, 2005.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিIUCN--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.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.