Wang, H., & Whittington, D. (2000). Willingness to pay for air quality improvements in Sofia, Bulgaria. World Bank.
Style de citation Chicago (17e éd.)Wang, Hua, et Dale Whittington. Willingness to Pay for Air Quality Improvements in Sofia, Bulgaria. Washington, D.C: World Bank, 2000.
Style de citation MLA (9e éd.)Wang, Hua, et Dale Whittington. Willingness to Pay for Air Quality Improvements in Sofia, Bulgaria. World Bank, 2000.
Attention : ces citations peuvent ne pas être correctes à 100%.