<ref name="Creighton_1928">{{cite journal |first1=W. S. |last1=Creighton |year=1928 |title=Notes on three abnormal ants |url=http://hymfiles.biosci.ohio-state.edu/pdfs-osuc/9710/9710.pdf |journal=Psyche (Cambridge) |publisher= |volume=35 |issue= |pages=51–55 |doi= }}</ref>