To cite HASP in publications, please use:

  DeCicco, L.A., Prinos, S.T., Eslick-Huff, P.J., Hopkins, C.B., 2022,
  HASP: Hydrologic AnalySis Package, v1.0.0.,
  https://code.usgs.gov/water/stats/hasp, doi:10.5066/P9BUN5GV

A BibTeX entry for LaTeX users is

  @Manual{,
    author = {Laura DeCicco and Scott Prinos and Patrick Eslick-Huff and Candice Hopkins and Tara Root},
    title = {HASP: Hydrologic AnalySis Package},
    publisher = {U.S. Geological Survey},
    address = {Reston, VA},
    version = {1.0.0},
    institution = {U.S. Geological Survey},
    year = {2022},
    doi = {10.5066/P9BUN5GV},
    url = {https://code.usgs.gov/water/stats/hasp},
  }