To cite package ‘capr’ in publications use:

  Luo X, Zhao Y, Caffo B (2026). _capr: Covariate Assisted Principal
  Regression_. R package version 0.2.0,
  <https://CRAN.R-project.org/package=capr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {capr: Covariate Assisted Principal Regression},
    author = {Xi Luo and Yi Zhao and Brian Caffo},
    year = {2026},
    note = {R package version 0.2.0},
    url = {https://CRAN.R-project.org/package=capr},
  }