To cite package ‘qqtest’ in publications use:

  Oldford W (2026). _qqtest: Self Calibrating Quantile-Quantile Plots
  for Visual Testing_. R package version 1.2.1,
  <https://CRAN.R-project.org/package=qqtest>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {qqtest: Self Calibrating Quantile-Quantile Plots for Visual Testing},
    author = {Wayne Oldford},
    year = {2026},
    note = {R package version 1.2.1},
    url = {https://CRAN.R-project.org/package=qqtest},
  }