To cite package ‘clickrup’ in publications use:

  Solymos P, Müller K (2021). _clickrup: Interacting with the ClickUp
  v2 API from R_. R package version 0.0.6,
  <https://github.com/psolymos/clickrup>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {clickrup: Interacting with the ClickUp v2 API from R},
    author = {Peter Solymos and Kirill Müller},
    year = {2021},
    note = {R package version 0.0.6},
    url = {https://github.com/psolymos/clickrup},
  }