Campanula rotundifolia subsp. bulgarica (Witasek) Hayek in Repert. Spec. Nov. Regni Veg. Beih. 30(2): 538. 1930
Campanula rotundifolia subsp. bulgarica in Repert. Spec. Nov. Regni Veg. Beih. 30(2): 538. 1930
is new combination for Campanula bulgarica in Magyar Bot. Lapok 5: 244. 1906
Campanula rotundifolia subsp. bulgarica in Repert. Spec. Nov. Regni Veg. Beih. 30(2): 538. 1930