=J.T. Houghton, John T. Houghton, Y. Ding, D.J. Griggs, M. Noguer: "Climate Change 2001: Working Group I: The Scientific Basis" [4], 2001., publisher=Intergovernmental Panel on Climate Change, chapter=6.11 Total Solar Irradiance—Figure 6.6: Global, annual mean radiative forcings (1750 to present), [5]Arhivirano 2006-06-14 na Wayback Machine-u
=J.T. Houghton, John T. Houghton, Y. Ding, D.J. Griggs, M. Noguer: "Climate Change 2001: Working Group I: The Scientific Basis" [4], 2001., publisher=Intergovernmental Panel on Climate Change, chapter=6.11 Total Solar Irradiance—Figure 6.6: Global, annual mean radiative forcings (1750 to present), [5]Arhivirano 2006-06-14 na Wayback Machine-u