References
- Dostál , J . 1976 . “ Centaurea L ” . In Flora Europea , Edited by: TG , Tutin , VH , Heywood , NA , Burges , DM , Moore , DH , Valentine , SM , Walters and DA , Webb . Vol. 4 , 254–300 Cambridge : Cambridge University Press .
- IUCN . 2001 . “ IUCN Red List Categories and Criteria: Version 3.1 ” . ii + 30 Gland , Switzerland and Cambridge, UK : IUCN Species Survival Commission, IUCN .
- Pisanu , S , Filigheddu , R and Farris , E . 2009 . The conservation status of an endemic species of northern Sardinia: Centaurea horrida Badarò (Asteraceae) . Plant Biosyst , 143 : 275 – 282 .