Para citar el paquete eph puedes usar:

  Diego Kozlowski, Pablo Tiscornia, Guido Weksler, German Rosati and
  Natsumi Shokida (2020).  eph: Argentina's Permanent Household Survey
  Data and Manipulation Utilities. R package version
  https://doi.org/10.5281/zenodo.3462677

A BibTeX entry for LaTeX users is

  @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},
  }