?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Wal%2C+R.+J.+van+de&rft.aulast=Wal&rft.aufirst=R.+J.+van+de&rft.degree=Bachelor&rft.title=Sustainable+tourism+in+Rotterdam%3A+an+indicator-based+review&rft.date=2018