<ref name="Creighton_1950">{{cite journal |first1=W. S. |last1=Creighton |year=1950 |title=The ants of North America |url=https://antcat.org/documents/801/6224.pdf |journal=Bulletin of the Museum of Comparative Zoology |publisher= |volume=104 |issue= |pages=1–585 |doi= }}</ref>