@misc{indiciaeb472c3543b3a,
  title = {Identifying and assessing ecotourism visitor impacts at selected protected areas in Costa Rica and Belize},
  author = {T. A. Farrell and J. L. Marion},
  year = {2002},
  doi = {10.1017/s0376892901000224},
  url = {https://pubs.usgs.gov/publication/5224123},
  note = {Source identifier: 5224123}
}