@misc{indiciae5d959fe404f6,
  title = {The role of recreation ecology in sustainable tourism and ecotourism},
  author = {Y.-F. Leung and J. L. Marion and T. A. Farrell},
  year = {2001},
  url = {https://pubs.usgs.gov/publication/5211192},
  note = {Source identifier: 5211192}
}