@inproceedings{bloyer_gustke_leung_2004, title={Indicators for sustainable tourism development: Crossing the divide from definitions to actions}, booktitle={Sustainable tourism}, publisher={Southampton, UK: Wessex Institute of Technology Press}, author={Bloyer, J. and Gustke, L. and Leung, Y.-F}, editor={F. D. Pineda and Brebbia, C. A.Editors}, year={2004}, pages={109–115} }
 @article{siderelis_gustke_2000, title={Influence of on-site choices on recreation demand}, volume={22}, ISSN={["0149-0400"]}, DOI={10.1080/014904000272894}, number={2}, journal={LEISURE SCIENCES}, author={Siderelis, C and Gustke, L}, year={2000}, pages={123–132} }