Joseph Leidy: Fresh-water rhizopods of north America. Serie: Report of the United States Geological Survey of the Territories, Band 12. Biodiversity Heritage Library & Canadian Libraries, 1879. S. 253–256. BHL, Book Reader.
Joseph Leidy: Fresh-water rhizopods of north America. Serie: Report of the United States Geological Survey of the Territories, Band 12. Biodiversity Heritage Library & Canadian Libraries, 1879. S. 253–256. BHL, Book Reader.