Compositae Working Group (CWG) (2024). Global Compositae Database.
Carduus spinulosus Glaab. Accessed through: Marine Species Traits editorial board (2024) Marine Species Traits at: https://marinespecies.org/traits/aphia.php?p=taxdetails&id=1123126 on 2025-03-12
Marine Species Traits editorial board (2025). Marine Species Traits.
Carduus spinulosus Glaab. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1123126 on 2025-03-12