To cite the 'rrum' R package and method paper in publications use:

  Culpepper, S. A., Hudson, A., and Balamuta, J. J. (2019) rrum:
  Bayesian Estimation of the Reduced Reparameterized Unified Model with
  Gibbs Sampling. URL https://cran.r-project.org/package=rrum.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{rrum: Bayesian Estimation of the Reduced Reparameterized Unified Model with Gibbs Sampling}},
    author = {Steven Andrew Culpepper and Aaron Hudson and James Joseph Balamuta},
    year = {2019},
  }

  Culpepper, S. A. and Hudson, A. (2018). An Improved Strategy for
  Bayesian Estimation of the Reduced Reparameterized Unified Model.
  Applied Psychological Measurement, 42(2), 99–115. URL
  https://doi.org/10.1177/0146621617707511.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{An Improved Strategy for Bayesian Estimation of the Reduced Reparameterized Unified Model}},
    author = {Steven Andrew Culpepper and Aaron Hudson},
    journal = {Applied Psychological Measurement},
    url = {https://doi.org/10.1177/0146621617707511},
    volume = {42},
    number = {2},
    pages = {99-115},
    year = {2018},
    doi = {10.1177/0146621617707511},
  }