To cite package ‘defineOptions’ in publications use:

Umehara T (2023). defineOptions: Define and Parse Command Line Options. R package version 0.9, https://github.com/niceume/defineoptions.

Corresponding BibTeX entry:

  @Manual{,
    title = {defineOptions: Define and Parse Command Line Options},
    author = {Toshihiro Umehara},
    year = {2023},
    note = {R package version 0.9},
    url = {https://github.com/niceume/defineoptions},
  }