1. Arkell, W.J., Kummel, B., Wright, C.W., 1957. Mesozoic Ammonoidea, pp. L80–L465. In: Moore, R.C. (Ed.), Treatise on Invertebrate Palaeontology Part L, Mollusca 4, Cephalopoda Ammonoidea. Geological Society of America and University of Kansas Press, New York and Lawrence, xxii+490 p.
2. Geology of Madagascar: a brief outline;Ashwall;Gondwana Research,1999
3. Description of some Cretaceous fossils from South Africa;Baily;Quarterly Journal of the Geological Society of London,1855
4. Notes on the geology of Madagascar;Baron;Quarterly Journal of the Geological Society of London,1889
5. Geological notes of a journey in Madagascar;Baron;Quarterly Journal of the Geological Society of London,1895