Karaer, Fergan, and Ferhat Celep. “Rediscovery of <i>Scorzonera amasiana< i> Hausskn. And Bornm. - A Threatened Endemic Species in Turkey”.
Bangladesh Journal of Botany
, vol. 36, no. 2, Oct. 2008, pp. 139-44, doi:10.3329/bjb.v36i2.1502.