Biscutum Black in Black & Barnes, 1959
Black, M. (1971): Coccoliths of the Speeton Clay and Sutterby Marl. - Proceedings of the Yorkshire Geological Society. 38: 381-424.
Black, M. & Barnes, B., (1959): The structure of Coccoliths from the English Chalk. - Geological Magazine. 96(5): 321-328.