Taxon - Odkazy a literatura
Havlíček V. (1994): Kvania n. g. and Petrocrania Raymond (Brachiopoda, Ordovician) in the Prague Basin, Journal of the Czech Geological Society 39/4 [jako Petrocrania zukalovae Ficner & Havlíček, 1978]
Havlíček V. (1994): Kvania n. g. and Petrocrania Raymond (Brachiopoda, Ordovician) in the Prague Basin, Journal of the Czech Geological Society 39/4 [jako Petrocrania zukalovae Ficner & Havlíček, 1978]