To cite package ‘rvgpm’ in publications use:

  Last F (2018). _rvgpm: What the Package Does (One Line, Title Case)_.
  R package version 0.0.0.9000, <https://github.com/sosoc/rvgpm>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rvgpm: What the Package Does (One Line, Title Case)},
    author = {First Last},
    year = {2018},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/sosoc/rvgpm},
  }