To cite package ‘SPmodels’ in publications use:

  Johnson O (2026). _SPmodels: Spatial Models for Research and
  Teaching_. R package version 0.1.1,
  <https://github.com/olatunjijohnson/spmodels>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {SPmodels: Spatial Models for Research and Teaching},
    author = {Olatunji Johnson},
    year = {2026},
    note = {R package version 0.1.1},
    url = {https://github.com/olatunjijohnson/spmodels},
  }