@inbook{Mace2005,
author = {Mace, R. and Sear, R. },
title= {Are humans cooperative breeders?},
year = {2005},
editor = {Voland, E.},
editor = {Chasiotis, A.},
editor = {Schiefenhoevel, W.},
booktitle = {Grandmotherhood: The Evolutionary Significance of the Second Half of Female Life},
address = {New Brunswick},
publisher = {Rutgers University Press},
pages = {143--159},
}