To cite package ‘QR.break’ in publications use:

  Qu Z, Oka T (2025). _QR.break: Structural Breaks in Quantile
  Regression_. R package version 1.0.2,
  <https://CRAN.R-project.org/package=QR.break>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {QR.break: Structural Breaks in Quantile Regression},
    author = {Zhongjun Qu and Tatsushi Oka},
    year = {2025},
    note = {R package version 1.0.2},
    url = {https://CRAN.R-project.org/package=QR.break},
  }