Mann, M. E.; Zhang, Z.; Rutherford, S.; Bradley, R. S.; Hughes, M. K.; Shindell, D.; Ammann, C.; Faluvegi, G.; Ni, F. (2009). “Global Signatures and Dynamical Origins of the Little Ice Age and Medieval Climate Anomaly”. Science. 326 (5957): 1256. doi:10.1126/science.1177303. PMID19965474.
Mann, M. E.; Zhang, Z.; Rutherford, S.; Bradley, R. S.; Hughes, M. K.; Shindell, D.; Ammann, C.; Faluvegi, G.; Ni, F. (2009). “Global Signatures and Dynamical Origins of the Little Ice Age and Medieval Climate Anomaly”. Science. 326 (5957): 1256. doi:10.1126/science.1177303. PMID19965474.