<ref name="Creighton_1951">{{cite journal |first1=W. S. |last1=Creighton |year=1951 |title=Studies on Arizona ants. 1. The habits of ''Camponotus ulcerosus'' Wheeler and its identity with ''C. bruesi'' Wheeler |url=https://antcat.org/documents/790/6226.pdf |journal=Psyche (Cambridge) |publisher= |volume=58 |issue= |pages=47–64 |doi= }}</ref>