To cite package ‘emo’ in publications use:

Wickham H, François R, D'Agostino McGowan L (2019). emo: Easily Insert 'Emoji'. R package version 0.0.0.9000, https://github.com/hadley/emo.

Corresponding BibTeX entry:

  @Manual{,
    title = {emo: Easily Insert 'Emoji'},
    author = {Hadley Wickham and Romain François and Lucy {D'Agostino
      McGowan}},
    year = {2019},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/hadley/emo},
  }