Cita APA (7th ed.)

Heil, M., & Pargal, S. (1998). Reducing air pollution from urban passenger transport: A framework for policy analysis. World Bank.

Cita Chicago (17th ed.)

Heil, Mark, i Sheoli Pargal. Reducing Air Pollution from Urban Passenger Transport: A Framework for Policy Analysis. Washington, D.C: World Bank, 1998.

Cita MLA (9th ed.)

Heil, Mark, i Sheoli Pargal. Reducing Air Pollution from Urban Passenger Transport: A Framework for Policy Analysis. World Bank, 1998.