To cite package ‘highlight’ in publications use:

  Francois R (2024). _highlight: Syntax Highlighter_. R package version
  0.5.1.9000, <https://github.com/hadley/highlight>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {highlight: Syntax Highlighter},
    author = {Romain Francois},
    year = {2024},
    note = {R package version 0.5.1.9000},
    url = {https://github.com/hadley/highlight},
  }