Cardiola

Kříž, J. (2008). A new bivalve community from the lower Ludlow of the Prague Basin (Perunica, Bohemia). <em>Bulletin of Geosciences.</em> 83(3): 237-280.

Murchison, R. I. (1839). The Silurian system, founded on geological researches in the counties of Salop, Hereford, Radnor, Montgomery, Caermarthen, Brecon, Pembroke, Monmouth, Gloucester, Worcester, and Stafford : with descriptions of the coalfields and overlying formations. [Book, 3 volumes, vol 1 by Murchison] John Murray, Albemarle Street.