Elejalde, M. A., Muñoz, B., Arrébola, J. R. & Gómez-Moliner, B. J. 2005. Phylogenetic relationships of Iberus gualtieranus and I. alonensis (Gastropoda: Helicidae) based on partial mitochondrial 16S rRNA and coi gene sequences. Journal of Molluscan Studies, 71(4):349-355; (Resumen).