{{sfn|Boesch|Hohmann|Marchant|2002|p=}}

* {{cite book | last=Boesch | first=Christophe | last2=Hohmann | first2=Gottfried | last3=Marchant | first3=Linda Frances | title=Behavioural Diversity in Chimpanzees and Bonobos | publisher=Cambridge University Press | publication-place=Camrbridge | date=2002-08 | isbn=0-521-00613-9}}

<ref name="v065">{{cite book | last=Boesch | first=Christophe | last2=Hohmann | first2=Gottfried | last3=Marchant | first3=Linda Frances | title=Behavioural Diversity in Chimpanzees and Bonobos | publisher=Cambridge University Press | publication-place=Camrbridge | date=2002-08 | isbn=0-521-00613-9 | page=}}</ref>