Bolli, H. M. (1957). The genera Globigerina and Globorotalia in the Paleocene-lower Eocene Lizard Springs formation at Trinidad, B.W.I. Bulletin United States National Museum. 215: 61-82.
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Bolli, H. M.
1957
The genera Globigerina and Globorotalia in the Paleocene-lower Eocene Lizard Springs formation at Trinidad, B.W.I