Clearinghouse for Emission Inventories and Emissions Factors - Technology Transfer Network - US EPA (ed.). «Emissions Factors & AP 42». www.epa.gov. Consultado em 16 de abril de 2009
Clearinghouse for Emission Inventories and Emissions Factors - Technology Transfer Network - US EPA (ed.). «Emissions Factors & AP 42». www.epa.gov. Consultado em 28 de maio de 2009