<ref name="Evershed_&_Morgan_1981">{{cite journal |first1=R. P. |last1=Evershed |first2=E. D. |last2=Morgan |year=1981 |title=Chemical investigations of the Dufour gland contents of attine ants |url= |journal=Insect Biochemistry |publisher= |volume=11 |issue= |pages=343–351 |doi= }}</ref>