Taxon - Odkazy a literatura
Lemke U. (2019): Catalogue of the available names and non available names of the species and subspecies for the class Trilobita [jako Geragnostus (Geragnostus) crassus Tjernvik 1956]Datum citace: 27. únor 2020
Lemke U. (2019): Catalogue of the available names and non available names of the species and subspecies for the class Trilobita [jako Geragnostus (Geragnostus) crassus Tjernvik 1956]