Janiga, M., and A. Mičková. “The Biology of the Alpine Accentor Prunella Collaris. V. The Sex Ratio and Transmission of Lice Philopterus Emiliae”. Oecologia Montana 13, no. 1-2 (December 1, 2004): 17-22. Accessed July 10, 2020. http://om.vuvb.uniza.sk/index.php/OM/article/view/174.