Williams, R. C. (2000). Environmental tax interactions when pollution affects health or productivity. National Bureau of Economic Research.
Chicago-viite (17. p.)Williams, Roberton C. Environmental Tax Interactions When Pollution Affects Health or Productivity. Cambridge: National Bureau of Economic Research, 2000.
MLA-viite (9. p.)Williams, Roberton C. Environmental Tax Interactions When Pollution Affects Health or Productivity. National Bureau of Economic Research, 2000.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.