To cite package ‘twoway’ in publications use:

  Friendly M, Heiberger RM (2026). _twoway: Analysis of Two-Way
  Tables_. R package version 0.7.0,
  <https://CRAN.R-project.org/package=twoway>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {twoway: Analysis of Two-Way Tables},
    author = {Michael Friendly and Richard M. Heiberger},
    year = {2026},
    note = {R package version 0.7.0},
    url = {https://CRAN.R-project.org/package=twoway},
  }