Dyfyniad APA

Williams, R. C. (2000). Environmental tax interactions when pollution affects health or productivity. National Bureau of Economic Research.

Dyfyniad Arddull Chicago

Williams, Roberton C. Environmental Tax Interactions When Pollution Affects Health or Productivity. Cambridge: National Bureau of Economic Research, 2000.

Dyfyniad MLA

Williams, Roberton C. Environmental Tax Interactions When Pollution Affects Health or Productivity. National Bureau of Economic Research, 2000.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.