To cite package ‘policytree’ in publications use:

  Sverdrup E, Kanodia A, Zhou Z, Athey S, Wager S (2026). _policytree:
  Policy Learning via Doubly Robust Empirical Welfare Maximization over
  Trees_. R package version 1.2.4,
  <https://CRAN.R-project.org/package=policytree>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {policytree: Policy Learning via Doubly Robust Empirical Welfare Maximization
over Trees},
    author = {Erik Sverdrup and Ayush Kanodia and Zhengyuan Zhou and Susan Athey and Stefan Wager},
    year = {2026},
    note = {R package version 1.2.4},
    url = {https://CRAN.R-project.org/package=policytree},
  }