Cushman,J.A. (1927): New and interseting foraminifera from Mexico and Texas . Contributions from the Cushman Foundation for Foraminiferal Research Vol. 3 p. 111-119
Cushman,J.A. and Bermudez,P.J. (1949): Some Cuban species of Globorotalia . Contributions from the Cushman Foundation for Foraminiferal Research Vol. 25 p. 26-44
Beckmann,J.P. (1953): Die Foraminiferen der Oceanic Formation (Eocaen-Oligocaen) von Barbados, Kl. Antillen . Ecoglae geologicae Helvetiae Vol. 46 p. 301-412
Bolli,H.M. (1957): Planktonic Foraminifera from the Eocene Navet and San Fernando formations of Trinidad, B.W.I. . Bull. U.S. natl. Mus. Vol. 215 p. 155-172
|