To cite package ‘certemail’ in publications use:

Berends MS, Hassing EEA, Dijkstra E (2026). certemail: A Certe R Package for Automated Mailing. R package version 1.8.0, https://github.com/certe-medical-epidemiology/certemail.

Corresponding BibTeX entry:

  @Manual{,
    title = {certemail: A Certe R Package for Automated Mailing},
    author = {Matthijs S. Berends and Erwin E. A. Hassing and Erwin
      Dijkstra},
    year = {2026},
    note = {R package version 1.8.0},
    url = {https://github.com/certe-medical-epidemiology/certemail},
  }