To cite EGRET in publications, please use:

  Hirsch, R.M., De Cicco, L.A., Murphy, J., 2024, Exploration and
  Graphics for RivEr Trends (EGRET), version 3.0.10,
  doi:10.5066/P9CC9JEX

A BibTeX entry for LaTeX users is

  @Manual{,
    author = {Robert Hirsch and Laura DeCicco and Jennifer Murphy},
    title = {Exploration and Graphics for RivEr Trends (EGRET)},
    publisher = {U.S. Geological Survey},
    year = {2024},
    url = {https://pubs.usgs.gov/tm/04/a10/},
  }