1. Keupp, H., Engeser, T., Fuchs, D. & Haechel, W. Ein Trachyteuthis hastiformis (Cephalopoda, Coleoidea) mit Spermatophoren aus dem Ober-Kimmeridgium von Painten (Ostbayern). Archaeopteryx 28, 23–30 (2010).
2. Keupp, H., Saad, P. A. & Schweigert, G. Nautiliden mit Kiefern und Mageninhalt. Fossilien 2016, 42–47 (2016).
3. Kruta, I., Landman, N. H., Rouget, I., Cecca, F. & Larson, N. L. The Jaw apparatus of the Late Cretaceous ammonite. Didymoceras. J. Paleontol. 84, 556–560 (2010).
4. Klug, C. & Lehmann, J. Soft part anatomy of ammonoids: Reconstructing the animal based on exceptionally preserved specimens and actualistic comparisons. In: Klug, C., Korn, D., De Baets, K., Kruta, I. & Mapes, R. H. (eds). Ammonoid paleobiology: From anatomy to ecology. Springer, Dordrecht, 507–529 (2015).
5. Hauff, B. & Hauff, R. B. Das Holzmadenbuch. Museum Hauff, Holzmaden ⁄ Teck (1981).