?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Adena&rft.au=Adena%2C+M&rft.aufirst=M&rft.volume=172&rft.title=Journal+of+Public+Economics&rft.atitle=Giving+once%2C+giving+twice%3A+A+two-period+field+experiment+on+intertemporal+crowding+in+charitable+giving&rft.pages=127-134&rft.issn=0047-2727&rft.date=April+2019&rft.genre=article