BioStor
 | XLVIII.—Notes on the Botany of Sicily John Ball (1843) Annals And Magazine of Natural History 11: 338-351 |
 | XXIX.—Botanical notices from Spain Moritz Willkomm (1846) Annals And Magazine of Natural History 17: 187-196 |
 | Notes sur la biologie de quelques Coléoptères phytophages du Nord africain (2e série) P E Y E R I M H O F F De Fontenelle Paul Marie (1915) Annales de la Société Entomologique de France 84: 19-61 |
 | Analysis of the Flora of Mediterranean and Saharan Africa P Quezel (1978) Annals of the Missouri Botanical Garden 65: 479-534 |
 | The genera of Cardueae (Compositae; Asteraceae) in the southeastern United States R W Scott (1990) Journal of the Arnold Arboretum 71: 391-451 |