U.S. Environmental Protection Agency. Inventory of the U.S. greenhouse gas emissions and sinks , 1990-2010.
Chicago-referens (17:e uppl.)U.S. Environmental Protection Agency. Inventory of the U.S. Greenhouse Gas Emissions and Sinks , 1990-2010.
MLA-referens (9:e uppl.)U.S. Environmental Protection Agency. Inventory of the U.S. Greenhouse Gas Emissions and Sinks , 1990-2010.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.