To cite logitr in publications use:

  Helveston JP (2023). “logitr: Fast Estimation of Multinomial and
  Mixed Logit Models with Preference Space and Willingness-to-Pay Space
  Utility Parameterizations.” _Journal of Statistical Software_,
  *105*(10), 1-37. doi:10.18637/jss.v105.i10
  <https://doi.org/10.18637/jss.v105.i10>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{logitr}: Fast Estimation of Multinomial and Mixed Logit Models with Preference Space and Willingness-to-Pay Space Utility Parameterizations},
    author = {John Paul Helveston},
    journal = {Journal of Statistical Software},
    year = {2023},
    volume = {105},
    number = {10},
    pages = {1--37},
    doi = {10.18637/jss.v105.i10},
  }