"EFJO Joensuu"(PDF). AIP Suomi / Finland. Finavia. 6 May 2010. pp. EFJO AD 2.1, pp. 1–12. Archived from the original(PDF) on 27 March 2017. Retrieved 18 July 2011.
"Lämpötilaennätyksiä" (in Finnish). Finnish Meteorological Institute. Archived from the original on 7 November 2017. Retrieved 3 January 2017.
web.archive.org
"EFJO Joensuu"(PDF). AIP Suomi / Finland. Finavia. 6 May 2010. pp. EFJO AD 2.1, pp. 1–12. Archived from the original(PDF) on 27 March 2017. Retrieved 18 July 2011.