To cite package ‘makedummies’ in publications use:

Ara T (2019). makedummies: Create Dummy Variables from Categorical Data. R package version 1.2.1, https://github.com/toshi-ara/makedummies.

Corresponding BibTeX entry:

  @Manual{,
    title = {makedummies: Create Dummy Variables from Categorical
      Data},
    author = {Toshiaki Ara},
    year = {2019},
    note = {R package version 1.2.1},
    url = {https://github.com/toshi-ara/makedummies},
  }