To cite package ‘costdecade’ in publications use:

  Verlander J (2026). _costdecade: Price Durability by the Decade, Not
  the Receipt_. R package version 0.1.0,
  <https://github.com/scrapertweeter3-prog/costdecade>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {costdecade: Price Durability by the Decade, Not the Receipt},
    author = {James Verlander},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://github.com/scrapertweeter3-prog/costdecade},
  }