1. Arkel, W. J. (1956): Jurassic Geology of the World, London.
2. Bowen, R. (1961, a): Palaeotemperature Analysis of Mesozoic Belemnoides from Germany and Poland. - Journ. Geol.,69.
3. -: (1961 b): Palaeotemperature Analysis of Belemnoidea and Jurassic Paleoclimatology. - Journ. Geol.,69.
4. -: (1962): Palaeotemperature Analysis of Jurassic Belemnoidea from East Greenland, Experientia,18.
5. Bowen, R. &Fritz, P. (1963): Oxygen Isotope Paleotemperature Analysis of Lower and Middle Jurassic Fossils from Pliensbach, Wü rttemberg (Germany). - Experientia,19.