To cite package ‘ButtR’ in publications use:

  Silva D, McLean J (2026). _ButtR: Download and Extract Data from the
  'OzButterflies' Database_. R package version 1.1.1,
  <https://github.com/diogojackson/buttr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ButtR: Download and Extract Data from the 'OzButterflies' Database},
    author = {Diogo Silva and Jim McLean},
    year = {2026},
    note = {R package version 1.1.1},
    url = {https://github.com/diogojackson/buttr},
  }