To cite package ‘roadoi’ in publications use:

  Jahn N (2024). _roadoi: Find Free Versions of Scholarly Publications
  via Unpaywall_. R package version 0.7.3, ,
  <https://github.com/ropensci/roadoi>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {roadoi: Find Free Versions of Scholarly Publications via Unpaywall},
    author = {Najko Jahn},
    year = {2024},
    note = {R package version 0.7.3, 
},
    url = {https://github.com/ropensci/roadoi},
  }