<ref name="Collingwood_1955">{{cite journal |first1=C. A. |last1=Collingwood |year=1955 |title=Ants in S.W. Scotland |url=https://antcat.org/documents/725/11300.pdf |journal=Entomologist's Record and Journal of Variation |publisher= |volume=67 |issue= |pages=11–12 |doi= }}</ref>