Taxon - Odkazy a literatura
The Interim Register of Marine and Nonmarine Genera [1350165]
Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [https://www.irmng.org] [jako Polycyphus L. Agassiz in Agassiz & Desor, 1846]
Datum citace: 29. listopad 2019
Paleobiology Database [32981]
Paleobiology Database [https://paleobiodb.org/] [jako Polycyphus Agassiz & Desor, 1846]
Datum citace: 11. prosinec 2015
Echinoid Directory [1542]
Smith A. B. (ed.) (2005): Echinoid Directory [http://www.nhm.ac.uk/research-curation/p...], Natural History Museum, London [jako Polycyphus]
Datum citace: 4. březen 2016