To cite package ‘validatetools’ in publications use:

  de Jonge E, van der Loo M (2024). _validatetools: Checking and
  Simplifying Validation Rule Sets_. R package version 0.5.2,
  <https://github.com/data-cleaning/validatetools>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {validatetools: Checking and Simplifying Validation Rule Sets},
    author = {Edwin {de Jonge} and Mark {van der Loo}},
    year = {2024},
    note = {R package version 0.5.2},
    url = {https://github.com/data-cleaning/validatetools},
  }