To cite package ‘kgschart’ in publications use:

  Mori K (2017). _kgschart: KGS Rank Graph Parser_. R package version
  1.3.5, <https://CRAN.R-project.org/package=kgschart>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {kgschart: KGS Rank Graph Parser},
    author = {Kota Mori},
    year = {2017},
    note = {R package version 1.3.5},
    url = {https://CRAN.R-project.org/package=kgschart},
  }