?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Poelsema%2C+K&rft.aulast=Poelsema&rft.aufirst=K&rft.degree=Bachelor&rft.date=2017&rft.title=Duurzame+projecten+en+crowdfunding