To cite the R package p3state.msm in publications use:

  Luís Meira-Machado, Javier Roca-Pardiñas and Artur Araújo (2025).
  p3state.msm: Analyzing Survival Data from an Illness-Death Model. R
  package version 1.3.3. URL
  https://CRAN.R-project.org/package=p3state.msm.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {p3state.msm: Analyzing Survival Data from an Illness-Death Model},
    author = {Luís Meira-Machado and Javier Roca-Pardiñas and Artur Araújo},
    year = {2025},
    note = {R package version 1.3.3},
    url = {https://CRAN.R-project.org/package=p3state.msm},
  }

  Luis Meira-Machado, Javier Roca-Pardiñas (2011). “p3state.msm:
  Analyzing Survival Data from an Illness-Death Model”. Journal of
  Statistical Software, 38(3), 1-18. doi:10.18637/jss.v038.i03

A BibTeX entry for LaTeX users is

  @Article{,
    title = {p3state.msm: Analyzing Survival Data from an Illness-Death Model},
    author = {Luís Meira-Machado and Javier Roca-Pardiñas},
    journal = {Journal of Statistical Software},
    year = {2011},
    volume = {38},
    number = {3},
    pages = {1--18},
    doi = {10.18637/jss.v038.i03},
  }