Beckmann, J. P. 1994. Late Albian to Early Eocene. In: Bolli, H.M.; Beckmann, J.P.; Saunders, J.B. (Editors), Benthic foraminiferal biostratigraphy of the south Caribbean Region, pp 47-228. Cambridge University Press.
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Beckmann, J. P. 1994. Late Albian to Early Eocene. In: Bolli, H.M.; Beckmann, J.P.; Saunders, J.B. (Editors), Benthic foraminiferal biostratigraphy of the south Caribbean Region, pp 47-228. Cambridge University Press.