To cite package ‘gg.layers’ in publications use:

  Kong D (2026). _gg.layers: ggplot layers_. R package version 0.1.3,
  <https://github.com/rpkgs/gg.layers>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {gg.layers: ggplot layers},
    author = {Dongdong Kong},
    year = {2026},
    note = {R package version 0.1.3},
    url = {https://github.com/rpkgs/gg.layers},
  }