To cite package ‘commonmark’ in publications use:

  Ooms J (2024). _commonmark: High Performance CommonMark and Github
  Markdown Rendering in R_. R package version 1.9.3,
  <https://github.com/r-lib/commonmark>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {commonmark: High Performance CommonMark and Github Markdown Rendering in R},
    author = {Jeroen Ooms},
    year = {2024},
    note = {R package version 1.9.3},
    url = {https://github.com/r-lib/commonmark},
  }