1. Note on an indication of depth of primaeval seas afforded by the remains of colour in Fossil Testacea;Forbes;Proc. R. Soc. Lond.,1854
2. A Monograph of the British Fossil Brachiopoda. V: The Carboniferous Brachiopoda;Davidson,1858
3. Uber die Wohnsitze der Brachiopoden;Suess,1859
4. Periostracum and color preservation in Lingula from the Upper Ordovician of northern Kentucky;Singh;J. Paleontol.,1979
5. Color patterns on Silurian Platyceras and Devonian Merista from the Barrandian area, Bohemia, Czechoslovakia;Kriz;J. Paleontol.,1974