To cite package ‘ImpactEffectsize’ in publications use:

  Jorn Lotsch and Alfred Ultsch (2020). A non-parametric effect-size
  measure capturing changes in central tendency and data distribution
  shape. PLoS One. 2020 Sep 24;15(9):e0239623.
  https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0239623.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {A non-parametric effect-size measure capturing changes in central tendency and data distribution shape},
    author = {Jörn Lötsch and Alfred Ultsch},
    journal = {PLoS One},
    year = {2020},
    volume = {15},
    number = {9},
    pages = {e0239623},
    url = {https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0239623},
    doi = {10.1371/journal.pone.0239623},
  }