To cite package ‘wmm’ in publications use:

  Frierson W (2025). _wmm: World Magnetic Model_. R package version
  1.1.2, <https://github.com/wfrierson/wmm>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {wmm: World Magnetic Model},
    author = {Will Frierson},
    year = {2025},
    note = {R package version 1.1.2},
    url = {https://github.com/wfrierson/wmm},
  }