To cite package ‘bggum’ in publications use:

  Duck-Mayr J, Montgomery J (2020). _bggum: Bayesian Estimation of
  Generalized Graded Unfolding Model Parameters_. R package version
  1.0.2.9000, <https://github.com/duckmayr/bggum>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {bggum: Bayesian Estimation of Generalized Graded Unfolding Model
Parameters},
    author = {JBrandon Duck-Mayr and Jacob Montgomery},
    year = {2020},
    note = {R package version 1.0.2.9000},
    url = {https://github.com/duckmayr/bggum},
  }