To cite package ‘rebus.unicode’ in publications use:

Cotton R (2017). rebus.unicode: Unicode Extensions for the 'rebus' Package. R package version 0.0-3, https://github.com/richierocks/rebus.unicode.

Corresponding BibTeX entry:

  @Manual{,
    title = {rebus.unicode: Unicode Extensions for the 'rebus'
      Package},
    author = {Richard Cotton},
    year = {2017},
    note = {R package version 0.0-3},
    url = {https://github.com/richierocks/rebus.unicode},
  }