@misc{indiciaef2ca34a4c1d7,
  title = {Visual encounter surveys. Chapter 2 in Measuring and monitoring biological diversity: Standard methods for amphibians},
  author = {M.L. Crump and N.J. Scott},
  year = {1994},
  url = {https://pubs.usgs.gov/publication/81573},
  note = {Source identifier: 81573}
}