<ref name="King_1955">{{cite journal |first1=R. L. |last1=King |year=1955 |title=Winged workers in the ant, ''Formica'' ''obscuriventris'' ''clivia'' Creighton |url= |journal=Proceedings of the Iowa Academy of Science |publisher= |volume=62 |issue= |pages=509–513 |doi= }}</ref>