To cite package ‘adverbial’ in publications use:

  Uchida M (2026). _adverbial: Enhanced Adverbial Functions_. R package
  version 0.2.1, <https://github.com/uchidamizuki/adverbial>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {adverbial: Enhanced Adverbial Functions},
    author = {Mizuki Uchida},
    year = {2026},
    note = {R package version 0.2.1},
    url = {https://github.com/uchidamizuki/adverbial},
  }