To cite package ‘kgc’ in publications use:

Bryant C, Wheeler N, Rubel F, French R (2017). kgc: Koeppen-Geiger Climatic Zones. R package version 1.0.0.2, https://CRAN.R-project.org/package=kgc.

Corresponding BibTeX entry:

  @Manual{,
    title = {kgc: Koeppen-Geiger Climatic Zones},
    author = {Chelsey Bryant and Nicholas R. Wheeler and Franz Rubel
      and Roger H. French},
    year = {2017},
    note = {R package version 1.0.0.2},
    url = {https://CRAN.R-project.org/package=kgc},
  }