To cite xptr in publications use:

  Lai R, Eddelbuettel D (2025). _xptr: Manipulating External Pointers_.
  doi:10.32614/CRAN.package.xptr
  <https://doi.org/10.32614/CRAN.package.xptr>. R package version
  1.2.0.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{xptr}: Manipulating External Pointers},
    author = {Randy Lai and Dirk Eddelbuettel},
    year = {2025},
    note = {R package version 1.2.0},
    doi = {10.32614/CRAN.package.xptr},
  }