To cite package ‘assertthat’ in publications use:

Wickham H (2019). assertthat: Easy Pre and Post Assertions. R package version 0.2.1.9000, https://github.com/hadley/assertthat.

Corresponding BibTeX entry:

  @Manual{,
    title = {assertthat: Easy Pre and Post Assertions},
    author = {Hadley Wickham},
    year = {2019},
    note = {R package version 0.2.1.9000},
    url = {https://github.com/hadley/assertthat},
  }