To cite package ‘grantham’ in publications use:

  Magno R, Duarte I, Maia A (2024). _grantham: Calculate the 'Grantham'
  Distance_. R package version 0.1.1, ,
  <https://github.com/maialab/grantham>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {grantham: Calculate the 'Grantham' Distance},
    author = {Ramiro Magno and Isabel Duarte and Ana-Teresa Maia},
    year = {2024},
    note = {R package version 0.1.1, },
    url = {https://github.com/maialab/grantham},
  }