To cite cchs in publications use:

E. Jones (2018), cchs: An R Package for Stratified Case-Cohort Studies, R Journal, 10(1), 484-494. https://doi.org/10.32614/RJ-2018-012

Corresponding BibTeX entry:

  @Article{,
    title = {{cchs}: {A}n {R} Package for Stratified Case-Cohort
      Studies},
    author = {E. Jones},
    year = {2018},
    journal = {R Journal},
    volume = {10},
    number = {1},
    pages = {484--494},
    url = {https://doi.org/10.32614/RJ-2018-012},
  }