To cite the 'DNAtools' package in publications use:

  Tvedebrink T, Andersen MM, Curran JM (2020). DNAtools: Tools for
  Analysing Forensic Genetic DNA Data. Journal of Open Source Software,
  5(45), 1981, URL https://doi.org/10.21105/joss.01981

A BibTeX entry for LaTeX users is

  @Article{,
    title = {{DNAtools: Tools for Analysing Forensic Genetic DNA Data}},
    author = {Torben Tvedebrink and Mikkel Meyer Andersen and James Michael Curran},
    journal = {Journal of Open Source Software},
    year = {2020},
    volume = {5},
    number = {45},
    url = {https://doi.org/10.21105/joss.01981},
  }