<ref name="Price_et_al_1991">{{cite book |first1=P. W. |last1=Price |first2=T. M. |last2=Lewinsohn |first3=G. W. |last3=Fernandes |first4=W. W. |last4=Benson |year=1991 |title=Plant-animal interactions. Evolutionary ecology in tropical and temperate regions |url= |location=New York |publisher=J. Wiley |pages=xiv + 639 pp. |isbn=}}</ref>