To cite package ‘barrel’ in publications use:

  Author A (2025). _barrel: Covariance-Based Ellipses for Ordination
  Plots_. R package version 0.1.0,
  <https://github.com/barrancoelena/barrel>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {barrel: Covariance-Based Ellipses for Ordination Plots},
    author = {Anonymous Author},
    year = {2025},
    note = {R package version 0.1.0},
    url = {https://github.com/barrancoelena/barrel},
  }