<ref name="Johnson_1988">{{cite journal |first1=N. F. |last1=Johnson |year=1988 |title=Midcoxal articulations and the phylogeny of the order Hymenoptera |url=http://hymfiles.biosci.ohio-state.edu/pdfs-osuc/21153/21153.pdf |journal=Annals of the Entomological Society of America |publisher= |volume=81 |issue= |pages=870–881 |doi= }}</ref>