Kew (2022): Kew science – Plants of the World Online - Plants of the World Online | Kew Science
Ranjbar M. & Negaresh K. (2013): A contribution to the genus Amberboa (Asteraceae, Cardueae, Centaureinae) from Iran. Willdenowia 43: 271-277.
Sebald O., Seybold S. & G. Philippi (1990): Die Farn- und Blütenpflanzen Baden-Württembergs, Bd. 1: Lycopodiaceae bis Plumbaginaceae. 2. Aufl., Verlag E. Ulmer, Stuttgart.
Seebens H., Blackburn T. M., Dyer E. E., Genovesi P., Hulme P. E., Jeschke J. M., Pagad S., Pyšek P., Winter M., Arianoutsou M., Bacher S., Blasius B., Brundu G., Capinha C., Celesti-Grapow L., Dawson W., Dullinger S., Fuentes N., Jäger H., Kartesz J., Kenis M., Kreft H., Kühn I., Lenzner B., Liebhold A., Mosena A. (2017): No saturation in the accumulation of alien species worldwide. Nature Communications 8(2).
Susanna A., Garcia-Jacas N., Soltis D.E. & Soltis P.S. (1995): Phylogenetic relationships in tribe Cardueae (Asteraceae) based on ITS sequences. American Journal of Botany 82: 1056-1068.
Verloove V. (2021): Manual of the Alien Plants of Belgium – http://alienplantsbelgium.be