Caudullo, G., Welk, E., San-Miguel-Ayanz, J., 2017. Chorological maps for the main European woody species. Data in Brief 12, 662-666. DOI: 10.1016/j.dib.2017.05.007
Data: https://doi.org/10.6084/m9.figshare.5100727
References:

• Bartha D., Bán M., Schmidt D., Tiborcz V. Vascular plants of Hungary online database. Department of Botany and Nature Conservation, Faculty of Forestry, Sopron University.
• Bundesamt für Naturschutz (BfN). FloraWeb. Floristische Verbreitungskarten in Deutschland. Accessed in July 2024.
• Fang, J., Wang, Z., Tang, Z. (Eds.), 2011. Atlas of Woody Plants in China. Springer Berlin Heidelberg, Berlin, Heidelberg.
• Grossgeim, A. A., 1945. Flora of Caucasus Vol 3. Academy of Sciences of the USSR, Azerbaijan branch. Baku (In Russian)
• Hultén, E., 1971. Atlas över växternas utbredning i Norden, 2nd edition. Generalstabens litografiska anstalts förlag, Stockholm.
• Hultén, E., Fries, M., 1986. Atlas of North European vascular plants (North of the Tropic of Cancer), Vols. I-III. Koeltz scientific books. 國際標準書號 3874292630
• Jalas, J., Suominen, J.(Eds.), 1976. Atlas Florae Europaeae: distribution of vascular plants in Europe Vol. 3 Salicaceae to Balanophoraceae. Committee for Mapping the Flora of Europe and Societas Biologica Fennica Vanario, Helsinki.
• Little, E.L., Jr., 1976. Atlas of United States trees, volume 3, minor Western hardwoods. U.S. Department of Agriculture Miscellaneous Publication 1314.
• Little, E.L., Jr., 1977. Atlas of United States trees, volume 4, minor Eastern hardwoods. U.S. Department of Agriculture Miscellaneous Publication 1342.
• Meusel, H., Jäger, E. J., Weinert, E. (Eds.), 1965. Vergleichende Chorologie der Zentraleuropäischen Flora, Band I. Gustav Fischer Verlag, Jena.
• Mogîldea, D., Sahlean, T. C., & Biță-Nicolae, C., 2024. Riparian Forests of Alnus Species Communities and Their Role in Sustainability in the Romanian Carpathians and Adjacent Regions. Sustainability, 16(10), 4130.
• Nikolić, T. (Ed.), 2015. Flora Croatica Database. Faculty of Science, University of Zagreb. Accessed in July 2024.
• Peruzzi L., Roma-Marzio, F., Pinzani, L., Bedini G. Wikiplantbase #Italia. Università di Pisa.
• Schadauer K., Niese G., Matzik H., 1996. Österreichische Waldinventur (ÖWI) 1992-96 - Baumartenatlas. Bundesforschungszentrum für Wald (BFW).
• Sokolov S. I., Svjaseva O. A., Kubli V. A., 1980. Areas of distribution of trees and shrubs in the USSR, vol 1. Nauka, Leningrad. (In Russian)
• Stroh, P.A, Humphrey, T.A., Burkmar, R.J., Pescott, O.L., Roy, D.B., Walker, K.J. BSBI Online Plant Atlas 2020. Accessed in July 2024.
• Tela Botanica. eFlore. Accessed in July 2024.
• Zając, A., Zając, M. (Eds.) 2001. Atlas rozmieszczenia roślin naczyniowych w Polsce - Distribution Atlas of Vascular Plants in Poland. Institute of Botany, Jagiellonian University, Kraków. ISBN: 9788391516119
• iNaturalist community. Observations of Alnus incana. Accessed in July 2024.