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Wingard, G. L.; Sohl, N. F. (1990). Revision of the Nucula percrassa Conrad, 1858 group in the Upper Cretaceous of the Gulf and Mid-Atlantic coastal plains: an example of bias in the nomenclature. United States Geological Survey Bulletin. 1881-D: 1-25, pls. 1-7.
Wingard, G. L.; Sohl, N. F. (1990). Revision of the Nucula percrassa Conrad, 1858 group in the Upper Cretaceous of the Gulf and Mid-Atlantic coastal plains: an example of bias in the nomenclature. United States Geological Survey Bulletin. 1881-D: 1-25, pls. 1-7.
