<ref name="Kannowski_1956">{{cite journal |first1=P. B. |last1=Kannowski |year=1956 |title=The ants of Ramsey County, North Dakota |url=https://antcat.org/documents/7843/kannowski_1956a.pdf |journal=American Midland Naturalist |publisher= |volume=56 |issue= |pages=168–185 |doi= }}</ref>