Roth, Peter H.; Bowdler, Jay L. (1981): Middle Cretaceous calcareous nannoplankton biostratigraphy and oceanography of the Atlantic Ocean. SEPM (Society for Sedimentary Geology), Tulsa, OK, United States, In: Warme, John E. (editor), Douglas, Robert G. (editor), Winterer, Edward L. (editor), The Deep Sea Drilling Project; a decade of progress, 517-546, georefid:1982-040059