Casal, P. (2011). ROBIN DUNBAR. Professor of Evolutionary Anthropology at the University of Oxford. HOW MANY FRIENDS CAN WE HAVE? Universitat de València.
Chicago-Zitierstil (17. Ausg.)Casal, Paula. ROBIN DUNBAR. Professor of Evolutionary Anthropology at the University of Oxford. HOW MANY FRIENDS CAN WE HAVE? Universitat de València, 2011.
MLA-Zitierstil (9. Ausg.)Casal, Paula. ROBIN DUNBAR. Professor of Evolutionary Anthropology at the University of Oxford. HOW MANY FRIENDS CAN WE HAVE? Universitat de València, 2011.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.