?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=F.A.&rft.au=Kolthof%2C+F.A.&rft.aulast=Kolthof&rft.degree=Bachelor&rft.title=Outdoor+fitness+als+gratis+sportschool&rft.date=2018