Krugman, P. The bad economics of fossil fuel defenders. The Philippine Star.
Chicago-viite (17. p.)Krugman, Paul. "The Bad Economics of Fossil Fuel Defenders." The Philippine Star .
MLA-viite (9. p.)Krugman, Paul. "The Bad Economics of Fossil Fuel Defenders." The Philippine Star, .
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.