Template:Hay et al., 1967
- Hay, W.W., Mohler, H.P., Roth, P.H., Schmidt, R.R. & Boudreaux, J.E. 1967. Calcareous nannoplankton zonation of the Cenozoic of the Gulf Coast and Caribbean-Antillean area, and transoceanic correlation. Transactions of the Gulf Coast Association of Geological Societies 17: 428–480. DOI: 10.1306/5D25C21F-16C1-11D7-8645000102C1865D