To cite fhircrackr in publications use:

Peschel T, Gantner J, Przybilla J, Meineke F (2020). Handling HL7 FHIR resources in R with fhircrackr. R package version 0.1.0, https://CRAN.R-project.org/package=fhircrackr.

Corresponding BibTeX entry:

  @Manual{,
    title = {Handling HL7 FHIR resources in R with {fhircrackr}},
    author = {Thomas Peschel and Julia Gantner and Jens Przybilla and
      Frank Meineke},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=fhircrackr},
    year = {2020},
  }