To cite ppmf in publications use:

Kenny C (2025). ppmf: ppmf: Read Census Privacy Protected Microdata Files. R package, https://christophertkenny.com/ppmf/.

Corresponding BibTeX entry:

  @Manual{ppmf,
    title = {{ppmf}: ppmf: Read Census Privacy Protected Microdata
      Files},
    author = {Christopher T. Kenny},
    year = {2025},
    note = {R package},
    url = {https://christophertkenny.com/ppmf/},
  }