To cite package ‘ISO6976.2016’ in publications use:

  Forster R (2026). _ISO6976.2016: Calorific Values and Properties of
  Natural Gas per ISO 6976:2016_. R package version 0.1-0,
  <https://github.com/ruedigerforster/iso_6976>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ISO6976.2016: Calorific Values and Properties of Natural Gas per ISO 6976:2016},
    author = {Rüdiger Forster},
    year = {2026},
    note = {R package version 0.1-0},
    url = {https://github.com/ruedigerforster/iso_6976},
  }