APA (7th ed.) Citation

Popp, D. (2001). Pollution control innovations and the clean air act of 1990. National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Popp, David. Pollution Control Innovations and the Clean Air Act of 1990. Cambridge: National Bureau of Economic Research, 2001.

MLA (9th ed.) Citation

Popp, David. Pollution Control Innovations and the Clean Air Act of 1990. National Bureau of Economic Research, 2001.