To cite fhircrackr in publications use:

Peschel T, Palm J, Przybilla J, Meineke F (2021). Handling HL7 FHIR resources in R with fhircrackr. R package version 1.0.2, 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 Palm and Jens Przybilla and
      Frank Meineke},
    note = {R package version 1.0.2},
    url = {https://CRAN.R-project.org/package=fhircrackr},
    year = {2021},
  }