1. Anonymous, 1882, Congrès International de Géologie, Comptes Rendus de la 2ème Session, Bologna 1881. Bologna: Fava and Garagni, 661 pp.
2. The Lower Kimmeridge Clay at Westbury, Wiltshire, England;Birkelund;Proceedings of the Geologists’ Association,1983
3. Geology of the Barrandian: A Field Trip Guide;Chlupáč,1993
4. Guidelines and statutes of the International Commission of Stratigraphy (ICS);Cowie;Courier Forschungsinstitut Senckenberg,1986
5. A Geologic Time Scale 2004,2004