Taxon - Odkazy a literatura
Paleobiology Database [189758]
Paleobiology Database [https://paleobiodb.org/] [jako Cyclostigma Schrammen, 1912]
Datum citace: 13. prosinec 2015
The Interim Register of Marine and Nonmarine Genera [1332130]
Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [https://www.irmng.org] [jako Cyclostigma Schrammen, 1912]
Datum citace: 30. listopad 2019