To cite package ‘openaccess’ in publications use:

  Bakala L (2023). _openaccess: Check If a Paper Is in Open Access_. R
  package version 0.1.0, <https://github.com/turtletopia/openaccess>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {openaccess: Check If a Paper Is in Open Access},
    author = {Laura Bakala},
    year = {2023},
    note = {R package version 0.1.0},
    url = {https://github.com/turtletopia/openaccess},
  }