To cite package ‘sprex’ in publications use:

  Archer E (2024). _sprex: Species Richness and Extrapolation_. R
  package version 1.4.2, <https://github.com/ericarcher/sprex>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {sprex: Species Richness and Extrapolation},
    author = {Eric Archer},
    year = {2024},
    note = {R package version 1.4.2},
    url = {https://github.com/ericarcher/sprex},
  }