Taxon - Odkazy a literatura
Paleobiology Database [5766]
Paleobiology Database [https://paleobiodb.org/] [jako Petraia Münster, 1839]
Datum citace: 13. prosinec 2015
The Interim Register of Marine and Nonmarine Genera [1428897]
Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [https://www.irmng.org] [jako Petraia Münster, 1839]
Datum citace: 30. listopad 2019