Brummer, G. J. A., & Kroon, D. (1988). Planktonic foraminifers as tracers of ocean-climate history: Ontogeny, relationships and preservation of modern species and stable isotopes, phenotypes and assemblage distribution in different water masses. Free University Press.

Brummer, Gerard Johannes Augustinus, and Dirk Kroon. Planktonic Foraminifers as Tracers of Ocean-climate History: Ontogeny, Relationships and Preservation of Modern Species and Stable Isotopes, Phenotypes and Assemblage Distribution in Different Water Masses. Amsterdam: Free University Press, 1988.

Brummer, Gerard Johannes Augustinus, and Dirk Kroon. Planktonic Foraminifers as Tracers of Ocean-climate History: Ontogeny, Relationships and Preservation of Modern Species and Stable Isotopes, Phenotypes and Assemblage Distribution in Different Water Masses. Free University Press, 1988.