To cite package ‘fee’ in publications use:

  Godwin R (2025). _fee: Estimate the First-Exposure Effect (FEE) using
  Count Data Models_. R package version 1.0.0,
  <https://github.com/rtgodwin/fee>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {fee: Estimate the First-Exposure Effect (FEE) using Count Data Models},
    author = {Ryan T. Godwin},
    year = {2025},
    note = {R package version 1.0.0},
    url = {https://github.com/rtgodwin/fee},
  }