Cita APA

Wang, H., & Whittington, D. (2000). Willingness to pay for air quality improvements in Sofia, Bulgaria. Washington, DC: The World Bank, Development Research Group, Infrastructure and Environment.

Citación estilo Chicago

Wang, Hua, y Dale Whittington. Willingness to Pay for Air Quality Improvements in Sofia, Bulgaria. Washington, DC: The World Bank, Development Research Group, Infrastructure and Environment, 2000.

Cita MLA

Wang, Hua, y Dale Whittington. Willingness to Pay for Air Quality Improvements in Sofia, Bulgaria. Washington, DC: The World Bank, Development Research Group, Infrastructure and Environment, 2000.