Sowerby, J. de C. 1813. The Mineral Conchology of Great Britain; or Coloured Figures and Descriptions of those Remains of Testaceous Animals or Shells, which have been preserved at various times and depths in the Earth 1: 33-96, pls. 10-44. http://www.biodiversitylibrary.org/page/14387869.
J. de C. Sowerby, 1813. Mineral Conchology 1: 84, pl. 33, figs. 5-7.
J. de C. Sowerby, 1813. Mineral Conchology 1: 83, pl. 33, figs. 1-3.
J. de C. Sowerby, 1813. Mineral Conchology 1: 83, pl. 33, fig. 4.