@inbook{Dykstra2009,
author = {Dykstra, P.A. },
title= {Kin relationships},
year = {2009},
doi = {10.4135/9781412958479.n306},
editor = {Reis, H.T.},
editor = {Sprecher, S. },
booktitle = {Encyclopedia of human relationships},
address = {Thousand Oaks, CA},
publisher = {Sage},
pages = {951−954},
}