To cite package ‘gamlssx’ in publications use:

  Northrop PJ, Ji J (2024). _gamlssx: Generalized Additive Extreme
  Value Models for Location, Scale and Shape_. R package version 1.0.1,
  <https://CRAN.R-project.org/package=gamlssx>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {gamlssx: Generalized Additive Extreme Value Models for Location, Scale
and Shape},
    author = {Paul J. Northrop and Jennifer Ji},
    year = {2024},
    note = {R package version 1.0.1},
    url = {https://CRAN.R-project.org/package=gamlssx},
  }