Mortimer, R N; B Pomerol (1987). "Correlation of the Upper Cretaceous White Chalk (Turonian to Campanian) in the Anglo-Paris Basin". Proceedings of the Geologists' Association. 98 (2): 97–143. Bibcode:1987PrGA...98...97M. doi:10.1016/s0016-7878(87)80001-9.
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Mortimer, R N; B Pomerol (1987). "Correlation of the Upper Cretaceous White Chalk (Turonian to Campanian) in the Anglo-Paris Basin". Proceedings of the Geologists' Association. 98 (2): 97–143. Bibcode:1987PrGA...98...97M. doi:10.1016/s0016-7878(87)80001-9.