Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. Last update: July 16, 2017
Further reading
Hesse, P. (1921). Beiträge zur näheren Kenntnis der Subfamilie Fruticicolinae. Archiv für Molluskenkunde, 53 (1/2): 55–83. Frankfurt am Main
Elejalde M. A., Madeira M. J., Prieto C. E., Backeljau T., Gómez-Moliner B. J. (July 2009) "Molecular Phylogeny, Taxonomy, and Evolution of the Land Snail Genus Pyrenaearia (Gastropoda, Helicoidea)". American Malacological Bulletin27(1-2): 69–81.
doi:
10.4003/006.027.0206