Cita APA (7a ed.)

Gray, W. B., & Shadbegian, R. J. (2001). Plant vintage, technology, and environmental regulation. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Gray, Wayne B., y Ronald J. Shadbegian. Plant Vintage, Technology, and Environmental Regulation. Cambridge, MA: National Bureau of Economic Research, 2001.

Cita MLA (9a ed.)

Gray, Wayne B., y Ronald J. Shadbegian. Plant Vintage, Technology, and Environmental Regulation. National Bureau of Economic Research, 2001.