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2. The Bajocian of the Sherborne district: its relation to subjacent and superjacent strata;Buckman;Quarterly Journal of the Geological Society of London,1893
3. Buckman S. S. (1909–30) Type Ammonites (London & Thame), pp 1–7.
4. Callomon J. H. (1984) Proceedings of the Royal Institution of Great Britain The measurement of geological time, 56, pp 65–99.
5. A review of the ammonite horizons of the Aalenian — Lower Bajocian stages in the Middle Jurassic of southern England;Callomon;Memorie Descrittive della Carta Geologica d’Italia,1990