Brückner, M., and D. Mossakowski. “Phylogeny of the Genus <i>Percus</I> (Coleoptera: Carabidae) – Nuclear Genes and the Basal Splits”. Entomologica Fennica, vol. 17, no. 3, Sept. 2006, pp. 195–199, doi:10.33338/ef.84328.