Salvador, R. B. “The Fossil Pulmonate Snails of Sandelzhausen (Early/Middle Miocene, Germany): Succineidae, Testacelloidea and Helicoidea”. Zootaxa, vol. 3721, no. 2, Oct. 2013, pp. 157–171, doi:10.11646/zootaxa.3721.2.3.