To cite vtree in publications use:

Barrowman N, Webster RJ (2025). “Exploring Data Subsets with vtree.” Journal of Statistical Software, 114(4), 1–28. doi:10.18637/jss.v114.i04.

Corresponding BibTeX entry:

  @Article{,
    title = {Exploring Data Subsets with {vtree}},
    author = {Nick Barrowman and Richard J. Webster},
    journal = {Journal of Statistical Software},
    year = {2025},
    volume = {114},
    number = {4},
    pages = {1--28},
    doi = {10.18637/jss.v114.i04},
  }