To cite package ‘sisters’ in publications use:

  O'Meara B (2023). _sisters: Runs various sister group comparisons to
  test hypotheses about diversification_. R package version 0.0.0.9000,
  <https://github.com/bomeara/sisters>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {sisters: Runs various sister group comparisons to test hypotheses about
diversification},
    author = {Brian O'Meara},
    year = {2023},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/bomeara/sisters},
  }