Para citar el paquete eph puedes usar:

Kozlowski D, Tiscornia P, Weksler G, Rosati G, Shokida N (2020). eph: Argentina's Permanent Household Survey Data and Manipulation Utilities. doi:10.5281/zenodo.3462677. https://github.com/ropensci/eph.

Corresponding BibTeX entry:

  @Manual{kozlowski2020,
    title = {eph: Argentina's Permanent Household Survey Data and
      Manipulation Utilities},
    author = {Diego Kozlowski and Pablo Tiscornia and Guido Weksler and
      German Rosati and Natsumi Shokida},
    year = {2020},
    doi = {10.5281/zenodo.3462677},
    url = {https://github.com/ropensci/eph},
  }