To cite package ‘Recocrop’ in publications use:

  Hijmans R (2021). _Recocrop: Estimating Environmental Suitability for
  Plants_. R package version 0.4-0,
  <https://github.com/cropmodels/recocrop>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {Recocrop: Estimating Environmental Suitability for Plants},
    author = {Robert J. Hijmans},
    year = {2021},
    note = {R package version 0.4-0},
    url = {https://github.com/cropmodels/recocrop},
  }