To cite package ‘mapproj’ in publications use:

McIlroy D, Brownrigg R, Minka TP (2025). mapproj: Map Projections. R package version 1.2.12, https://CRAN.R-project.org/package=mapproj.

Corresponding BibTeX entry:

  @Manual{,
    title = {mapproj: Map Projections},
    author = {Doug McIlroy and Ray Brownrigg and Thomas P. Minka},
    year = {2025},
    note = {R package version 1.2.12},
    url = {https://CRAN.R-project.org/package=mapproj},
  }