To cite package 'rioja' in publications use:

Juggins S (2023). “rioja: Analysis of Quaternary Science Data.” R package version 1.0-6, https://cran.r-project.org/package=rioja.

Corresponding BibTeX entry:

  @Unpublished{,
    title = {rioja: Analysis of Quaternary Science Data},
    author = {Steve Juggins},
    year = {2023},
    note = {R package version 1.0-6},
    url = {https://cran.r-project.org/package=rioja},
  }