Taxon - Odkazy a literatura
The Interim Register of Marine and Nonmarine Genera [1312730]
Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [https://www.irmng.org] [jako Williamsonia W. Carruthers, 1870]
Datum citace: 3. leden 2020
Paleobiology Database [56244]
Paleobiology Database [https://paleobiodb.org/] [jako Williamsonia Carruthers, 1870]
Datum citace: 3. leden 2020