To cite package ‘klippy’ in publications use:

Lesur R (2019). klippy: Copy to Clipboard Buttons for R Markdown HTML Documents. R package version 0.0.0.9500, https://github.com/rlesur/klippy.

Corresponding BibTeX entry:

  @Manual{,
    title = {klippy: Copy to Clipboard Buttons for R Markdown HTML
      Documents},
    author = {Romain Lesur},
    year = {2019},
    note = {R package version 0.0.0.9500},
    url = {https://github.com/rlesur/klippy},
  }