<ref name="Bourke_&_Chan_1994">{{cite journal |first1=A. F. G. |last1=Bourke |first2=G. L. |last2=Chan |year=1994 |title=Split sex ratios in ants with multiple mating |url= |journal=Trends in Ecology and Evolution |publisher= |volume=9 |issue= |pages=120–122 |doi= }}</ref>