To cite package ‘gdtools’ in publications use:

Gohel D, Wickham H, Henry L, Ooms J (2026). gdtools: Font Metrics and Font Management Utilities for R Graphics. R package version 0.5.1, https://github.com/davidgohel/gdtools.

Corresponding BibTeX entry:

  @Manual{,
    title = {gdtools: Font Metrics and Font Management Utilities for R
      Graphics},
    author = {David Gohel and Hadley Wickham and Lionel Henry and
      Jeroen Ooms},
    year = {2026},
    note = {R package version 0.5.1},
    url = {https://github.com/davidgohel/gdtools},
  }