To cite package ‘groundhog’ in publications use:

Simonsohn U, Gruson H (2026). groundhog: Version-Control for CRAN, GitHub, and GitLab Packages. R package version 3.4.0, https://github.com/credibilitylab/groundhog.

Corresponding BibTeX entry:

  @Manual{,
    title = {groundhog: Version-Control for CRAN, GitHub, and GitLab
      Packages},
    author = {Uri Simonsohn and Hugo Gruson},
    year = {2026},
    note = {R package version 3.4.0},
    url = {https://github.com/credibilitylab/groundhog},
  }