To cite package ‘courieR’ in publications use:

  Li L (2026). _courieR: Migrate Installed R Packages Between R
  Versions_. R package version 0.3.0,
  <https://github.com/lennon-li/courier>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {courieR: Migrate Installed R Packages Between R Versions},
    author = {Lennon Li},
    year = {2026},
    note = {R package version 0.3.0},
    url = {https://github.com/lennon-li/courier},
  }