To cite package ‘gdxrrw’ in publications use:

  Dirkse S, Ferris M, Jain R (2021). _gdxrrw: An Interface Between
  'GAMS' and R_. R package version 1.0.10.9001,
  <https://github.com/pascal-sauer/gdxrrw>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {gdxrrw: An Interface Between 'GAMS' and R},
    author = {Steve Dirkse and Michael Ferris and Rishabh Jain},
    year = {2021},
    note = {R package version 1.0.10.9001},
    url = {https://github.com/pascal-sauer/gdxrrw},
  }