To cite etl in publications use:

Baumer BS (2017). “A Grammar for Reproducible and Painless Extract-Transform-Load Operations on Medium Data.” arXiv, 8(23), 1–24. https://arxiv.org/abs/1708.07073.

Corresponding BibTeX entry:

  @Article{,
    title = {A Grammar for Reproducible and Painless
      Extract-Transform-Load Operations on Medium Data},
    author = {Benjamin S. Baumer},
    journal = {arXiv},
    year = {2017},
    volume = {8},
    number = {23},
    pages = {1--24},
    url = {https://arxiv.org/abs/1708.07073},
  }