<ref name="Bagnall_1906">{{cite journal |first1=R. S. |last1=Bagnall |year=1906 |title=''Formicoxenus nitidulus'', Nyl., in the Northumberland and Durham district |url= |journal=Entomologist's Monthly Magazine |publisher= |volume=42 |issue= |pages=140 |doi= }}</ref>