Compositae Working Group (CWG) (2025). Global Compositae Database.
Hieracium froelichianum subsp. heterolobum (Zahn) Gottschl. & Greuter. Accessed through: Marine Species Traits editorial board (2025) Marine Species Traits at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1151900 on 2025-03-12
Marine Species Traits editorial board (2025). Marine Species Traits.
Hieracium froelichianum subsp. heterolobum (Zahn) Gottschl. & Greuter. Accessed at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1151900 on 2025-03-12