* {{cite book | last=May | first=Robert M. | title=Stability and complexity in model ecosystems | publisher=Princeton University Press | publication-place=Princeton, N.J | date=1973 | isbn=0-691-08125-5}}
<ref name="z464">{{cite book | last=May | first=Robert M. | title=Stability and complexity in model ecosystems | publisher=Princeton University Press | publication-place=Princeton, N.J | date=1973 | isbn=0-691-08125-5 | page=}}</ref>