To cite package ‘qrencoder’ in publications use:

  Rudis B (2024). _qrencoder: Quick Response Code (QR Code) / Matrix
  Barcode Creator_. R package version 0.2.1,
  <https://github.com/hrbrmstr/qrencoder>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {qrencoder: Quick Response Code (QR Code) / Matrix Barcode Creator},
    author = {Bob Rudis},
    year = {2024},
    note = {R package version 0.2.1},
    url = {https://github.com/hrbrmstr/qrencoder},
  }