?url_ver=Z39.88-2004&rft_id=10.1098%2Frstb.2015.0152&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Colleran&rft.aufirst=Heidi&rft.issue=1692&rft.volume=371&rft.date=April+2016&rft.issn=2054-0280&rft.atitle=The+cultural+evolution+of+fertility+decline&rft.title=Philosophical+Transactions+of+the+Royal+Society+B%3A+Biological+Sciences&rft.genre=article