To cite package ‘pagedown’ in publications use:

  Xie Y, Lesur R, Thorne B, Tan X (2024). _pagedown: Paginate the HTML
  Output of R Markdown with CSS for Print_. R package version 0.20.1,
  <https://github.com/rstudio/pagedown>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {pagedown: Paginate the HTML Output of R Markdown with CSS for Print},
    author = {Yihui Xie and Romain Lesur and Brent Thorne and Xianying Tan},
    year = {2024},
    note = {R package version 0.20.1},
    url = {https://github.com/rstudio/pagedown},
  }