1. Lower Kimeridgian ammonites from the drift of Lincolnshire;ARKELL;Palaeontology,1963
2. The Lower Kimmeridge Clay at Westbury, Wiltshire, England;BIRKELUND;Proceedings of the Geologists’ Association,1983
3. CALLOMON, J. H. and BIRKELUND, T. 1982. The ammonite zones of the Boreal Volgian (Upper Jurassic) in East Greenland. In EMBRY, A. F. and BALKWILL, H. R. (eds). Arctic Geology and Geophysics. Canadian Society of Petroleum Geologists Memoir, 8, 349-369.
4. The first rodent from the Marino Formation (Miocene) at Divisadero Largo (Mendoza, Argentina) and its biochronological implications;CERDEÑO;Revista Geológica de Chile,2007