To cite ruODK in publications use (with the correct version number:

Mayer, Florian Wendelin. (2020, Nov 19). ruODK: An R Client for the ODK Central API (Version X.X.X). Zenodo. https://doi.org/10.5281/zenodo.5559164

Corresponding BibTeX entry:

  @Misc{,
    title = {ruODK: Client for the ODK Central API},
    author = {Florian W. Mayer},
    note = {R package version X.X.X},
    year = {2020},
    url = {https://github.com/ropensci/ruODK},
  }