To cite package ‘plummy’ in publications use:

  Francis R (2026). _plummy: Custom ggplot2 themes_. R package version
  0.3, <https://github.com/royfrancis/plummy>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {plummy: Custom ggplot2 themes},
    author = {Roy Francis},
    year = {2026},
    version = {0.3},
    note = {R package version 0.3},
    url = {https://github.com/royfrancis/plummy},
  }