?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Polman&rft.au=Polman%2C+J.E.&rft.aufirst=J.E.&rft.degree=Master&rft.title=Starting+from+an+analysis+of+ecotourism+development+in+Shark+Bay%2C+what+can+the+Drentsche+Aa+learn+from+the+successful+practice+in+Shark+Bay+and+vice+versa%3F%2C+a+systemic+approach+to+ecotourism&rft.date=2014