APA
Keller W., Levinson A., . (1999). Environmental compliance costs and foreign direct investment inflows to U.S. states. Cambridge, Mass: National Bureau of Economic Research.
Chicago
Keller Wolfgang, Levinson Arik, . 1999. Environmental compliance costs and foreign direct investment inflows to U.S. states. Cambridge, Mass: National Bureau of Economic Research.
Harvard
Keller W., Levinson A., . (1999). Environmental compliance costs and foreign direct investment inflows to U.S. states. Cambridge, Mass: National Bureau of Economic Research.
MLA
Keller Wolfgang, Levinson Arik, . Environmental compliance costs and foreign direct investment inflows to U.S. states. Cambridge, Mass: National Bureau of Economic Research. 1999.