Taxon - Odkazy a literatura
The Interim Register of Marine and Nonmarine Genera [1206930]
Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [https://www.irmng.org] [jako Placopterina Hoare, Sturgeon & Kindt, 1978]
Datum citace: 4. duben 2020
Paleobiology Database [16923]
Paleobiology Database [https://paleobiodb.org/] [jako Placopterina Hoare, Sturgeon & E.Kindt, 1978]
Datum citace: 11. prosinec 2015