Cita APA (7a ed.)

Sigman, H. (2001). International spillovers and water quality in rivers: Do countries free ride? National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Sigman, Hilary. International Spillovers and Water Quality in Rivers: Do Countries Free Ride? Cambridge, MA: National Bureau of Economic Research, 2001.

Cita MLA (9a ed.)

Sigman, Hilary. International Spillovers and Water Quality in Rivers: Do Countries Free Ride? National Bureau of Economic Research, 2001.