To cite package ‘rCTOOL’ in publications use:

  Silva EHFMd, Serra J, Giannini-Kurina F (2026). _rCTOOL: Soil Organic
  Carbon Turnover Modelling with 'C-TOOL'_. R package version 3.1.0,
  <https://CRAN.R-project.org/package=rCTOOL>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {rCTOOL: Soil Organic Carbon Turnover Modelling with 'C-TOOL'},
    author = {Evandro H. Figueiredo Moura da Silva and João Serra and Franca Giannini-Kurina},
    year = {2026},
    note = {R package version 3.1.0},
    url = {https://CRAN.R-project.org/package=rCTOOL},
  }