To cite package ‘pdfcombiner’ in publications use:

  Choy S (2026). _pdfcombiner: Graphical User Interface for
  Manipulating PDF and Image Files_. R package version 1.9.8,
  <https://github.com/stevechoy/pdfcombiner>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {pdfcombiner: Graphical User Interface for Manipulating PDF and Image Files},
    author = {Steve Choy},
    year = {2026},
    note = {R package version 1.9.8},
    url = {https://github.com/stevechoy/pdfcombiner},
  }