To cite rsendinblue in publications use:

Casajus Nicolas (2021). rsendinblue: An R package to .... R package version 0.0.0.9000, https://github.com/FRBCesab/rsendinblue.

Corresponding BibTeX entry:

  @Manual{,
    title = {rsendinblue: {An} {R} package to ...},
    author = {{Casajus Nicolas}},
    year = {2021},
    note = {R package version 0.0.0.9000},
    url = {https://github.com/FRBCesab/rsendinblue},
  }