1. W. Althoff, "Palaeontographica, (A)." 92, "Die Ammonitenzonen der oberen Ludwigienschichten von Bielefeld." 1 (1940)
2. K. Bauer, "Aalener Jahrbuch 1982." "Der Bergbaupfad in Wasseralfingen." 123 (1982)
3. K. Bosch, "Blickpunkt Kahlenberg." "Geologie und Fossilien." 25 (2006)
4. S. S. Buckman, "Monographs of the Palaeontographical Society." "A monograph of the ammonites of the “Inferior Oolite series”." 456 (1887–1907)
5. S. S. Buckman, "Quarterly Journal of the Geological Society of London." 61, "On certain genera and species of Lytoceratidae." 142 (1905)