Ducci, F.; Tani, A. (2009). "Italian alder - Alnus cordata"(PDF). EUFORGEN Technical Guidelines for Conservation and Use. Archived from the original(PDF) on 2016-08-11. Retrieved 2016-10-19.
Ducci, F.; Tani, A. (2009). "Italian alder - Alnus cordata"(PDF). EUFORGEN Technical Guidelines for Conservation and Use. Archived from the original(PDF) on 2016-08-11. Retrieved 2016-10-19.