To cite package ‘iconic’ in publications use:

  Bresnahan S, Xiong C (2026). _iconic: Causal Model Selection with
  Genetic Instruments and Negative Controls_. R package version 0.99.3,
  <https://github.com/sbresnahan/iconic>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {iconic: Causal Model Selection with Genetic Instruments and Negative
Controls},
    author = {Sean T. Bresnahan and Charis Xiong},
    year = {2026},
    note = {R package version 0.99.3},
    url = {https://github.com/sbresnahan/iconic},
  }