To cite package ‘c3’ in publications use:

Johnson M (2021). c3: 'C3.js' Chart Library. R package version 0.3.1, https://github.com/mrjoh3/c3.

Corresponding BibTeX entry:

  @Manual{,
    title = {c3: 'C3.js' Chart Library},
    author = {Matt Johnson},
    year = {2021},
    note = {R package version 0.3.1},
    url = {https://github.com/mrjoh3/c3},
  }