To cite package ‘assertthat’ in publications use:

  Wickham H (2024). _assertthat: Easy Pre and Post Assertions_. R
  package version 0.2.1.9000, <https://github.com/hadley/assertthat>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {assertthat: Easy Pre and Post Assertions},
    author = {Hadley Wickham},
    year = {2024},
    note = {R package version 0.2.1.9000},
    url = {https://github.com/hadley/assertthat},
  }