Barron, John A.; Keller, Gerta; Dunn, Dean A. (1985): A multiple microfossil biochronology for the Miocene. Geological Society of America (GSA), Boulder, CO, United States, In: Kennett, James P. (editor), The Miocene ocean; paleoceanography and biogeography, 163, 21-36, georefid:1986-014900