To cite package ‘essHist’ in publications use:

  Li H, Sieling H (2019). _essHist: The Essential Histogram_. R package
  version 1.2.2, <https://github.com/housenli/esshist>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {essHist: The Essential Histogram},
    author = {Housen Li and Hannes Sieling},
    year = {2019},
    note = {R package version 1.2.2},
    url = {https://github.com/housenli/esshist},
  }