To cite package ‘gfonts’ in publications use:

Perrier V, Meyer F (2023). gfonts: Offline 'Google' Fonts for 'Markdown' and 'Shiny'. R package version 0.2.0, https://github.com/dreamrs/gfonts.

Corresponding BibTeX entry:

  @Manual{,
    title = {gfonts: Offline 'Google' Fonts for 'Markdown' and
      'Shiny'},
    author = {Victor Perrier and Fanny Meyer},
    year = {2023},
    note = {R package version 0.2.0},
    url = {https://github.com/dreamrs/gfonts},
  }