To cite rxref in publications, use:

  Smith S (2026). _rxref: Tidy Utilities for RxNorm and NDC
  Resolution_. R package version 0.4.0,
  <https://www.stevenmsmith.org/rxref/>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rxref: Tidy Utilities for RxNorm and NDC Resolution},
    author = {Steven Smith},
    year = {2026},
    note = {R package version 0.4.0},
    url = {https://www.stevenmsmith.org/rxref/},
  }