To cite package ‘ParallelTree’ in publications use:

  O'Keefe P (2026). _ParallelTree: Visualizing Multilevel Data with
  Parallel Tree Plots_. R package version 0.2.0,
  <https://CRAN.R-project.org/package=ParallelTree>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ParallelTree: Visualizing Multilevel Data with Parallel Tree Plots},
    author = {Patrick O'Keefe},
    year = {2026},
    note = {R package version 0.2.0},
    url = {https://CRAN.R-project.org/package=ParallelTree},
  }