To cite package ‘etl’ in publications use:

  Baumer B (2019). “A Grammar for Reproducible and Painless
  Extract-Transform-Load Operations on Medium Data.” _Journal of
  Computational and Graphical Statistics_, *28*(2), 256-264.
  doi:10.1080/10618600.2018.1512867
  <https://doi.org/10.1080/10618600.2018.1512867>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {A Grammar for Reproducible and Painless Extract-Transform-Load Operations on Medium Data},
    author = {Benjamin S. Baumer},
    journal = {Journal of Computational and Graphical Statistics},
    year = {2019},
    volume = {28},
    number = {2},
    pages = {256--264},
    doi = {10.1080/10618600.2018.1512867},
  }