Top global weather, water and climate events of the 20th century. www.noaanews.noaa.gov [online]. [cit. 2017-05-04]. Dostupné v archivu pořízeném z originálu dne 2011-10-19.
web.archive.org
Top global weather, water and climate events of the 20th century. www.noaanews.noaa.gov [online]. [cit. 2017-05-04]. Dostupné v archivu pořízeném z originálu dne 2011-10-19.