To cite package ‘flexfont’ in publications use:

  Cheng M, Kaufman R (2025). _flexfont: Flexible Font_. R package
  version 0.1.0, <https://github.com/coolbutuseless/flexfont>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {flexfont: Flexible Font},
    author = {Mike Cheng and Roni Kaufman},
    year = {2025},
    note = {R package version 0.1.0},
    url = {https://github.com/coolbutuseless/flexfont},
  }