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Onopordum acanthium L. | Albers, F. & W. Pröbsting. 1998. In R. Wisskirchen & H. Haeupler, Standardliste der Farn- und Blütenpflanzen Deutschlands. Bundesamt für Naturschutz & Verlag Eugen Ulmer, Stuttgart. | 98-00 | | 34 |
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Onopordum acanthium L. | Van Loon, J. C. & B. Kieft. 1980. In Chromosome number reports LXVIII. Taxon 29: 538–542. | 79-81 | | 34 |
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Onopordum acanthium L. | Kuzmanova, B., S. Georgieva & V. Nikolova. 1979. In IOPB chromosome number reports LXIV. Taxon 28:408. | 79-81 | | 34 |
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Onopordum acanthium L. | Morton, J. K. 1977. A cytological study of the Compositae (excluding Hieracium and Taraxacum) of the British Isles. Watsonia 11: 211–223. | 75-78 | | 34 |
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