Premoli Silva, Isabella; McNulty, C L (1984): (Figure 8b) Distribution of Cretaceous planktonic foraminifers, calpellionids and associated organisms from DSDP Hole 77-535. PANGAEA, https://doi.org/10.1594/PANGAEA.816794, In supplement to: Premoli Silva, I; McNulty, CL (1984): Planktonic foraminifers and calpionellids from Gulf of Mexico Sites, Deep Sea Drilling Project Leg 77. In: Buffler, RT; Schlager, W; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 77, 547-584, https://doi.org/10.2973/dsdp.proc.77.122.1984