<ref name="Nipperess_et_al_2008">{{cite journal |first1=D. A. |last1=Nipperess |first2=A. N. |last2=Andersen |first3=A. J. |last3=Pik |first4=R. |last4=Bramble |first5=P. |last5=Wilson |first6=A. J. |last6=Beattie |year=2008 |title=The influence of spatial scale on the congruence of classifications circumscribing morphological units of biodiversity |url=https://antcat.org/documents/4578/Nipperess_et_al_2008_Diversity_Distrib.pdf |journal=Diversity and Distributions |publisher= |volume=14 |issue= |pages=917–924 |doi= }}</ref>