To cite package ‘crossmatch’ in publications use:

  Heller R, Small D, Rosenbaum P (2024). _crossmatch: The Cross-Match
  Test_. R package version 1.4-0,
  <https://CRAN.R-project.org/package=crossmatch>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {crossmatch: The Cross-Match Test},
    author = {Ruth Heller and Dylan Small and Paul Rosenbaum},
    year = {2024},
    note = {R package version 1.4-0},
    url = {https://CRAN.R-project.org/package=crossmatch},
  }