Regular Echinoids from the Upper Cretaceous of Belgium and the Netherlands
Geys, J.F. (1980). Regular Echinoids from the Upper Cretaceous of Belgium and the Netherlands, in: Jangoux, M. (Ed.) Proceedings of the European Colloquim on Echinoderms, Brussels, 3-8 September 1979 = Actes du Colloque Européen sur les Echinoderms, Bruxelles, 3-8 septembre 1979. pp. 41-46, plates
In: Jangoux, M. (Ed.) (1980). Proceedings of the European Colloquim on Echinoderms, Brussels, 3-8 September 1979 = Actes du Colloque Européen sur les Echinoderms, Bruxelles, 3-8 septembre 1979. A.A. Balkema: Rotterdam. ISBN 90-6191-077-3. XVIII, 428 pp., meer
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