Template:Susanna et al., 1999
- Susanna, A., Garnatje, T. & Garcia-Jacas, N. 1999. Molecular phylogeny of Cheirolophus (Asteraceae: Cardueae-Centaureinae) based on ITS sequences of nuclear ribosomal DNA. Plant Systematics and Evolution 214(1–4): 147–160, DOI:10.1007/BF00985736.