@misc{indiciaeff2978e73d00,
  title = {Sustaining visitor use in protected areas: Future opportunities in recreation ecology research based on the USA experience},
  author = {Christopher A. Monz and David N. Cole and Yu-Fai Leung and Jeffrey L. Marion},
  year = {2009},
  doi = {10.1007/s00267-009-9406-5},
  url = {https://pubs.usgs.gov/publication/70003887},
  note = {Source identifier: 70003887}
}