To cite package ‘leafdown’ in publications use:

Gandenberger P (2022). leafdown: Provides Drill Down Functionality for 'leaflet' Choropleths. R package version 1.2.0, https://CRAN.R-project.org/package=leafdown.

Corresponding BibTeX entry:

  @Manual{,
    title = {leafdown: Provides Drill Down Functionality for 'leaflet'
      Choropleths},
    author = {Peter Gandenberger},
    year = {2022},
    note = {R package version 1.2.0},
    url = {https://CRAN.R-project.org/package=leafdown},
  }