To cite logitr in publications use:

Helveston JP (2022). logitr: Fast Estimation of Multinomial and Mixed Logit Models with Preference Space and Willingness to Pay Space Utility Parameterizations. R package, https://jhelvy.github.io/logitr/.

Corresponding BibTeX entry:

  @Manual{,
    title = {logitr: Fast Estimation of Multinomial and Mixed Logit
      Models with Preference Space and Willingness to Pay Space Utility
      Parameterizations},
    author = {John Paul Helveston},
    year = {2022},
    note = {R package},
    url = {https://jhelvy.github.io/logitr/},
  }