Alenius, Teija; Mokkonen, Teemu; Antti, Lahelma (January 2013). "Early Farming in the Northern Boreal Zone: Reassessing the History of Land Use in Southeastern Finland through High-Resolution Pollen Analysis". Geoarchaeology. 28 (January): 1–24. Bibcode:2013Gearc..28....1A. doi:10.1002/gea.21428.
Alenius, Teija; Mokkonen, Teemu; Antti, Lahelma (January 2013). "Early Farming in the Northern Boreal Zone: Reassessing the History of Land Use in Southeastern Finland through High-Resolution Pollen Analysis". Geoarchaeology. 28 (January): 1–24. Bibcode:2013Gearc..28....1A. doi:10.1002/gea.21428.
jarviwiki.fi
"Pihtipudas". Järviwiki. Finland's Environmental Administration. 2012. Retrieved 27 February 2012.