Bona, Mehmet. 2015. “Systematic Implications of Achene Characteristics in Genera <i>Centaurea</i> L., <i>Cyanus</i> Mill., <i>Psephellus</i> Cass. and <i>Rhaponticoides</I> Vaill. (Asteraceae)”. Bangladesh Journal of Plant Taxonomy 22 (2):125-36. https://doi.org/10.3329/bjpt.v22i2.26074.