To cite the greenbook package in publications:

Coverdale C (2026). greenbook: HM Treasury Green Book Cost-Benefit Analysis Primitives. R package version 0.1.0, https://github.com/charlescoverdale/greenbook.

HM Treasury (2026). “The Green Book: Central Government Guidance on Appraisal and Evaluation.” https://www.gov.uk/government/publications/the-green-book-appraisal-and-evaluation-in-central-government.

Corresponding BibTeX entries:

  @Manual{,
    title = {{greenbook}: HM Treasury Green Book Cost-Benefit Analysis
      Primitives},
    author = {Charles Coverdale},
    year = {2026},
    note = {R package version 0.1.0},
    url = {https://github.com/charlescoverdale/greenbook},
  }

  @Misc{,
    title = {The Green Book: Central Government Guidance on Appraisal
      and Evaluation},
    author = {{HM Treasury}},
    year = {2026},
    organization = {HM Treasury},
    url =
      {https://www.gov.uk/government/publications/the-green-book-appraisal-and-evaluation-in-central-government},
  }