To cite package ‘crownmetrics’ in publications use:

  Costa S, Machado G (2026). _crownmetrics: Tree Crown Shape and
  Morphometric Parameters_. R package version 0.1.0,
  <https://github.com/sergiocostafh/crownmetrics>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {crownmetrics: Tree Crown Shape and Morphometric Parameters},
    author = {Sergio Costa and Gilmara Machado},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://github.com/sergiocostafh/crownmetrics},
  }