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2. Upper Ordovician brachiopods from Västergötland, Sweden;Bergström;Geologica et Palaeontologica,1968
3. On some new species of fossils from the Quebec Group: containing descriptions and figures of new or little-known species of organic remains from the Silurian rocks;Billings;Geological Survey of Canada, Paleozoic Fossils,1862
4. On some atrypoid, retzioid, and athyridoid Brachiopoda;Boucot;Journal of Paleontology,1964
5. Bathymetric and isotopic evidence for a short-lived Late Ordovician glaciation in a greenhouse period;Brenchley;Geology,1994