Haas, M., and J. Kisková. “Absence of Blood Parasites in the Alpine Accentor Prunella Collaris”. Oecologia Montana 19, no. 1-2 (December 1, 2010): 30-34. Accessed November 24, 2020. https://om.vuvb.uniza.sk/index.php/OM/article/view/221.